Category:Reduce
This programming language may be used to instruct a computer to perform a task.
| Official website |
|---|
| Type expression: | Implicit |
|---|---|
| See Also: |
|
Reduce is the language used in the computer algebra system of the same name.
See Also
Awareness
If Reduce is a language you like, or are interested in, please inform your fellow members of the Reduce community; this page can't be emptied without your and their participation.
If Reduce is a language you like, or are interested in, please inform your fellow members of the Reduce community; this page can't be emptied without your and their participation.
Tasks not implemented in Reduce
1
2
4
9
A
- A+B
- ABC problem
- ADFGVX cipher
- AKS test for primes
- ASCII art diagram converter
- AVL tree
- Abbreviations, automatic
- Abbreviations, easy
- Abbreviations, simple
- Abelian sandpile model
- Abelian sandpile model/Identity
- Abstract type
- Abundant odd numbers
- Abundant, deficient and perfect number classifications
- Accumulator factory
- Achilles numbers
- Ackermann function
- Active Directory/Connect
- Active Directory/Search for a user
- Active object
- Add a variable to a class instance at runtime
- Additive primes
- Address of a variable
- Algebraic data types
- Align columns
- Aliquot sequence classifications
- Almkvist-Giullera formula for pi
- Almost prime
- Amb
- Amicable pairs
- Anadromes
- Anagram generator
- Anagrams
- Anagrams/Deranged anagrams
- Angle difference between two bearings
- Angles (geometric), normalization and conversion
- Animate a pendulum
- Animation
- Anonymous recursion
- Anti-primes
- Append a record to the end of a text file
- Apply a callback to an array
- Apply a digital filter (direct form II transposed)
- Approximate equality
- Arbitrary-precision integers (included)
- Archimedean spiral
- Arena storage pool
- Arithmetic derivative
- Arithmetic evaluation
- Arithmetic numbers
- Arithmetic-geometric mean
- Arithmetic-geometric mean/Calculate Pi
- Arithmetic/Complex
- Arithmetic/Integer
- Arithmetic/Rational
- Array concatenation
- Array length
- Arrays
- Ascending primes
- Assertions
- Associative array/Creation
- Associative array/Iteration
- Associative array/Merging
- Atomic updates
- Attractive numbers
- Average loop length
- Averages/Arithmetic mean
- Averages/Mean angle
- Averages/Mean time of day
- Averages/Median
- Averages/Mode
- Averages/Pythagorean means
- Averages/Root mean square
- Averages/Simple moving average
B
- Babbage problem
- Babylonian spiral
- Balanced brackets
- Balanced ternary
- Barnsley fern
- Base64 decode data
- Bell numbers
- Benford's law
- Bernoulli numbers
- Bernstein basis polynomials
- Best shuffle
- Bifid cipher
- Bin given limits
- Binary digits
- Binary search
- Binary strings
- Bioinformatics/Global alignment
- Bioinformatics/Sequence mutation
- Bioinformatics/base count
- Biorhythms
- Bitcoin/address validation
- Bitcoin/public point to address
- Bitmap
- Bitmap/Bresenham's line algorithm
- Bitmap/Bézier curves/Cubic
- Bitmap/Bézier curves/Quadratic
- Bitmap/Flood fill
- Bitmap/Histogram
- Bitmap/Midpoint circle algorithm
- Bitmap/PPM conversion through a pipe
- Bitmap/Read a PPM file
- Bitmap/Read an image through a pipe
- Bitmap/Write a PPM file
- Bitwise IO
- Bitwise operations
- Blum integer
- Boolean values
- Boustrophedon transform
- Box the compass
- Boyer-Moore string search
- Brace expansion
- Brazilian numbers
- Break OO privacy
- Brilliant numbers
- Brownian tree
- Bulls and cows
- Bulls and cows/Player
- Burrows–Wheeler transform
- Bézier curves/Intersections
C
- CRC-32
- CSV data manipulation
- CSV to HTML translation
- CUSIP
- Caesar cipher
- Calculating the value of e
- Calendar
- Calendar - for "REAL" programmers
- Calkin-Wilf sequence
- Call a foreign-language function
- Call a function
- Call a function in a shared library
- Call an object method
- Camel case and snake case
- Canny edge detector
- Canonicalize CIDR
- Cantor set
- Carmichael 3 strong pseudoprimes
- Cartesian product of two or more lists
- Case-sensitivity of identifiers
- Casting out nines
- Catalan numbers
- Catalan numbers/Pascal's triangle
- Catamorphism
- Catmull–Clark subdivision surface
- Centre and radius of a circle passing through 3 points in a plane
- Chaocipher
- Chaos game
- Character codes
- Chat server
- Check Machin-like formulas
- Check if a polygon overlaps with a rectangle
- Check if two polygons overlap
- Check input device is a terminal
- Check output device is a terminal
- Check that file exists
- Checkpoint synchronization
- Chernick's Carmichael numbers
- Cheryl's birthday
- Chinese remainder theorem
- Chinese zodiac
- Cholesky decomposition
- Chowla numbers
- Church numerals
- Circles of given radius through two points
- Circular primes
- Cistercian numerals
- Classes
- Closest-pair problem
- Closures/Value capture
- Collections
- Color of a screen pixel
- Color quantization
- Color wheel
- Colorful numbers
- Colour bars/Display
- Colour pinstripe/Display
- Colour pinstripe/Printer
- Combinations
- Combinations and permutations
- Combinations with repetitions
- Comma quibbling
- Command-line arguments
- Commatizing numbers
- Comments
- Compare a list of strings
- Compare length of two strings
- Compare sorting algorithms' performance
- Compile-time calculation
- Compiler/AST interpreter
- Compiler/code generator
- Compiler/lexical analyzer
- Compiler/syntax analyzer
- Compiler/virtual machine interpreter
- Composite numbers k with no single digit factors whose factors are all substrings of k
- Compound data type
- Concurrent computing
- Conditional structures
- Conjugate transpose
- Consecutive primes with ascending or descending differences
- Constrained genericity
- Constrained random points on a circle
- Continued fraction
- Continued fraction/Arithmetic/Construct from rational number
- Continued fraction/Arithmetic/G(matrix ng, continued fraction n)
- Continued fraction/Arithmetic/G(matrix ng, continued fraction n1, continued fraction n2)
- Convert decimal number to rational
- Convert seconds to compound duration
- Convex hull
- Conway's Game of Life
- Copy a string
- Copy stdin to stdout
- Count in factors
- Count in octal
- Count occurrences of a substring
- Count the coins
- Cramer's rule
- Create a file
- Create a file on magnetic tape
- Create a two-dimensional array at runtime
- Create an HTML table
- Create an object at a given address
- Cuban primes
- Cullen and Woodall numbers
- Cumulative standard deviation
- Currency
- Currying
- Curzon numbers
- Cut a rectangle
- Cycles of a permutation
- Cyclops numbers
- Cyclotomic polynomial
D
- DNS query
- Damm algorithm
- Date format
- Date manipulation
- Day of the week
- De Bruijn sequences
- De Polignac numbers
- Deal cards for FreeCell
- Death Star
- Deceptive numbers
- Deconvolution/1D
- Deconvolution/2D+
- Decorate-sort-undecorate idiom
- Deepcopy
- Define a primitive data type
- Delegates
- Delete a file
- Deming's funnel
- Department numbers
- Descending primes
- Detect division by zero
- Determinant and permanent
- Determine if a string has all the same characters
- Determine if a string has all unique characters
- Determine if a string is collapsible
- Determine if a string is numeric
- Determine if a string is squeezable
- Determine if only one instance is running
- Determine if two triangles overlap
- Determine sentence type
- Dice game probabilities
- Digital root
- Digital root/Multiplicative digital root
- Dijkstra's algorithm
- Dinesman's multiple-dwelling problem
- Dining philosophers
- Disarium numbers
- Discordian date
- Display a linear combination
- Display an outline as a nested table
- Distance and Bearing
- Distributed programming
- Distribution of 0 digits in factorial series
- Diversity prediction theorem
- Documentation
- Dominoes
- Doomsday rule
- Dot product
- Doubly-linked list/Definition
- Doubly-linked list/Element definition
- Doubly-linked list/Element insertion
- Doubly-linked list/Traversal
- Dragon curve
- Draw a clock
- Draw a cuboid
- Draw a pixel
- Draw a rotating cube
- Draw a sphere
- Duffinian numbers
- Dutch national flag problem
- Dynamic variable names
E
- EKG sequence convergence
- Earliest difference between prime gaps
- Eban numbers
- Echo server
- Eertree
- Egyptian division
- Element-wise operations
- Elementary cellular automaton
- Elementary cellular automaton/Infinite length
- Elementary cellular automaton/Random number generator
- Elliptic Curve Digital Signature Algorithm
- Elliptic curve arithmetic
- Emirp primes
- Empty directory
- Empty program
- Empty string
- Enforced immutability
- Entropy
- Entropy/Narcissist
- Enumerations
- Environment variables
- Equal prime and composite sums
- Equilibrium index
- Erdös-Selfridge categorization of primes
- Erdős-Nicolas numbers
- Esthetic numbers
- Ethiopian multiplication
- Euclid-Mullin sequence
- Euclidean rhythm
- Euler method
- Euler's constant 0.5772...
- Euler's identity
- Euler's sum of powers conjecture
- Evaluate binomial coefficients
- Even or odd
- Events
- Evolutionary algorithm
- Exceptions
- Exceptions/Catch an exception thrown in a nested call
- Executable library
- Execute Brain****
- Execute Computer/Zero
- Execute HQ9+
- Execute SNUSP
- Execute a Markov algorithm
- Execute a system command
- Exponentiation operator
- Exponentiation order
- Exponentiation with infix operators in (or operating on) the base
- Extend your language
- Extensible prime generator
- Extreme floating point values
F
- FASTA format
- FTP
- Faces from a mesh
- Factorial
- Factorial base numbers indexing permutations of a collection
- Factorial primes
- Factorions
- Factorize string into Lyndon words
- Factors of a Mersenne number
- Factors of an integer
- Fairshare between two and more
- Farey sequence
- Fast Fourier transform
- Faulhaber's formula
- Faulhaber's triangle
- Feigenbaum constant calculation
- Fermat numbers
- Fermat pseudoprimes
- Fibonacci n-step number sequences
- Fibonacci sequence
- Fibonacci word
- Fibonacci word/fractal
- File extension is in extensions list
- File input/output
- File modification time
- File size
- File size distribution
- Filter
- Find Chess960 starting position identifier
- Find common directory path
- Find duplicate files
- Find if a point is within a triangle
- Find largest left truncatable prime in a given base
- Find limit of recursion
- Find palindromic numbers in both binary and ternary bases
- Find the intersection of a line with a plane
- Find the intersection of two lines
- Find the last Sunday of each month
- Find the missing permutation
- First class environments
- First perfect square in base n with n unique digits
- First power of 2 that has leading decimal digits of 12
- First-class functions
- First-class functions/Use numbers analogously
- Five weekends
- Fivenum
- Fixed length records
- FizzBuzz
- Flatten a list
- Flipping bits game
- Flow-control structures
- Floyd's triangle
- Floyd-Warshall algorithm
- Forest fire
- Fork
- Formal power series
- Formatted numeric output
- Fortunate numbers
- Forward difference
- Four bit adder
- Four is magic
- Four is the number of letters in the ...
- Fractal tree
- Fraction reduction
- Fractran
- French Republican calendar
- Function composition
- Function definition
- Function frequency
- Function prototype
- Functional coverage tree
- Fusc sequence
G
- GSTrans string conversion
- GUI component interaction
- GUI enabling/disabling of controls
- GUI/Maximum window dimensions
- Galton box animation
- Gamma function
- Gapful numbers
- Gauss-Jordan matrix inversion
- Gaussian elimination
- Gaussian primes
- General FizzBuzz
- Generate Chess960 starting position
- Generate lower case ASCII alphabet
- Generate random chess position
- Generator/Exponential
- Generic swap
- Get system command output
- Giuga numbers
- Globally replace text in several files
- Go Fish
- Goldbach's comet
- Golden ratio/Convergence
- Gotchas
- Graph colouring
- Gray code
- Grayscale image
- Greatest common divisor
- Greatest element of a list
- Greatest prime dividing the n-th cubefree number
- Greatest subsequential sum
- Greedy algorithm for Egyptian fractions
- Greyscale bars/Display
- Guess the number
- Guess the number/With feedback
- Guess the number/With feedback (player)
H
- HTTP
- HTTPS
- HTTPS/Authenticated
- HTTPS/Client-authenticated
- Hailstone sequence
- Halt and catch fire
- Hamming numbers
- Handle a signal
- Happy numbers
- Harmonic series
- Harshad or Niven series
- Hash from two arrays
- Hash join
- Haversine formula
- Hello world/Graphical
- Hello world/Line printer
- Hello world/Newbie
- Hello world/Newline omission
- Hello world/Standard error
- Hello world/Text
- Hello world/Web server
- Here document
- Heronian triangles
- Hex words
- Hickerson series of almost integers
- Higher-order functions
- Hilbert curve
- History variables
- Hofstadter Figure-Figure sequences
- Hofstadter Q sequence
- Hofstadter-Conway $10,000 sequence
- Holidays related to Easter
- Home primes
- Honaker primes
- Honeycombs
- Horizontal sundial calculations
- Horner's rule for polynomial evaluation
- Host introspection
- Hostname
- Hough transform
- Huffman coding
- Humble numbers
- Hunt the Wumpus
I
- I before E except after C
- I'm a software engineer, get me out of here
- IBAN
- ISBN13 check digit
- Identity matrix
- Idiomatically determine all the characters that can be used for symbols
- Idiomatically determine all the lowercase and uppercase letters
- Idoneal numbers
- Image convolution
- Image noise
- Imaginary base numbers
- Include a file
- Inconsummate numbers in base 10
- Increasing gaps between consecutive Niven numbers
- Increment a numerical string
- Index finite lists of positive integers
- Infinity
- Inheritance/Multiple
- Inheritance/Single
- Input loop
- Integer comparison
- Integer overflow
- Integer sequence
- Interactive programming (repl)
- Intersecting number wheels
- Introspection
- Inverted index
- Inverted syntax
- Isograms and heterograms
- Isqrt (integer square root) of X
- Iterated digits squaring
J
- JSON
- Jacobi symbol
- Jacobsthal numbers
- Jaro similarity
- Jaro-Winkler distance
- Jensen's Device
- Jewels and stones
- Jordan-Pólya numbers
- JortSort
- Josephus problem
- Joystick position
- Juggler sequence
- Julia set
- Jump anywhere
K
- K-d tree
- K-means++ clustering
- Kaprekar numbers
- Kernighans large earthquake problem
- Keyboard input/Flush the keyboard buffer
- Keyboard input/Keypress check
- Keyboard input/Obtain a Y or N response
- Keyboard macros
- Klarner-Rado sequence
- Knapsack problem/0-1
- Knapsack problem/Bounded
- Knapsack problem/Continuous
- Knapsack problem/Unbounded
- Knight's tour
- Knuth shuffle
- Knuth's algorithm S
- Knuth's power tree
- Koch curve
- Kolakoski sequence
- Kosaraju
- Kronecker product
- Kronecker product based fractals
L
- LU decomposition
- LZW compression
- Lah numbers
- Langton's ant
- Largest int from concatenated ints
- Largest number divisible by its digits
- Largest proper divisor of n
- Last Friday of each month
- Last letter-first letter
- Latin Squares in reduced form
- Law of cosines - triples
- Leap year
- Least common multiple
- Left factorials
- Legendre prime counting function
- Leonardo numbers
- Letter frequency
- Levenshtein distance
- Levenshtein distance/Alignment
- Linear congruential generator
- List comprehensions
- List rooted trees
- Literals/Floating point
- Literals/Integer
- Literals/String
- Logical operations
- Logistic curve fitting in epidemiology
- Long literals, with continuations
- Long multiplication
- Long primes
- Long year
- Longest common subsequence
- Longest common substring
- Longest increasing subsequence
- Longest string challenge
- Look-and-say sequence
- Loop over multiple arrays simultaneously
- Loops/Break
- Loops/Continue
- Loops/Do-while
- Loops/Downward for
- Loops/For
- Loops/For with a specified step
- Loops/Foreach
- Loops/Increment loop index within loop body
- Loops/Infinite
- Loops/N plus one half
- Loops/Nested
- Loops/While
- Loops/With multiple ranges
- Loops/Wrong ranges
- Lucas-Lehmer test
- Lucky and even lucky numbers
- Ludic numbers
- Luhn test of credit card numbers
- Lychrel numbers
- Lyndon word
M
- MAC vendor lookup
- MD4
- MD5
- MD5/Implementation
- Machine code
- Mad Libs
- Magic 8-ball
- Magic constant
- Magic squares of doubly even order
- Magic squares of odd order
- Magic squares of singly even order
- Magnanimous numbers
- Main step of GOST 28147-89
- Make directory path
- Man or boy test
- Mandelbrot set
- Map range
- Mastermind
- Matrix chain multiplication
- Matrix digital rain
- Matrix multiplication
- Matrix transposition
- Matrix-exponentiation operator
- Maximum triangle path sum
- Mayan calendar
- Mayan numerals
- Maze generation
- Maze solving
- McNuggets problem
- Median filter
- Meissel–Mertens constant
- Memory allocation
- Memory layout of a data structure
- Menu
- Merge and aggregate datasets
- Mertens function
- Metallic ratios
- Metaprogramming
- Metered concurrency
- Metronome
- Mian-Chowla sequence
- Middle three digits
- Miller–Rabin primality test
- Mind boggling card trick
- Minesweeper game
- Minimal steps down to 1
- Minimum multiple of m where digital sum equals m
- Minimum positive multiple in base 10 using only 0 and 1
- Minkowski question-mark function
- Modified random distribution
- Modular arithmetic
- Modular exponentiation
- Modular inverse
- Monads/List monad
- Monads/Maybe monad
- Monads/Writer monad
- Monte Carlo methods
- Monty Hall problem
- Morse code
- Motzkin numbers
- Mouse position
- Move-to-front algorithm
- Multi-base primes
- Multi-dimensional array
- Multifactorial
- Multiple distinct objects
- Multiple regression
- Multiplication tables
- Multiplicative order
- Multisplit
- Munchausen numbers
- Munching squares
- Musical scale
- Mutex
- Mutual recursion
- Möbius function
N
- N'th
- N-queens problem
- N-smooth numbers
- Named parameters
- Naming conventions
- Narcissist
- Narcissistic decimal number
- Natural sorting
- Nautical bell
- Negative base numbers
- Nested function
- Nested templated data
- Next highest int from digits
- Nim game
- Non-continuous subsequences
- Non-decimal radices/Convert
- Non-decimal radices/Input
- Non-decimal radices/Output
- Non-transitive dice
- Nonoblock
- Nonogram solver
- Nth root
- Null object
- Number names
- Number reversal game
- Numbers k such that the last letter of k is the same as the first letter of k+1
- Numbers which are not the sum of distinct squares
- Numbers which are the cube roots of the product of their proper divisors
- Numbers with equal rises and falls
- Numeric error propagation
- Numerical and alphabetical suffixes
- Numerical integration
- Numerical integration/Gauss-Legendre Quadrature
O
- O'Halloran numbers
- OLE automation
- Object serialization
- Odd word problem
- Old Russian measure of length
- Old lady swallowed a fly
- One of n lines in a file
- One-dimensional cellular automata
- One-time pad
- OpenGL
- OpenWebNet password
- Operator precedence
- Optional parameters
- Order by pair comparisons
- Order disjoint list items
- Order two numerical lists
- Ordered partitions
- Ordered words
- Ormiston triples
- Own digits power sum
P
- P-Adic numbers, basic
- P-Adic square roots
- P-value correction
- Padovan n-step number sequences
- Padovan sequence
- Pairs with common factors
- Palindrome dates
- Palindrome detection
- Palindromic gapful numbers
- Pan base non-primes
- Pancake numbers
- Pangram checker
- Paraffins
- Parallel brute force
- Parallel calculations
- Parameterized SQL statement
- Parametric polymorphism
- Parse an IP Address
- Parsing/RPN calculator algorithm
- Parsing/RPN to infix conversion
- Parsing/Shunting-yard algorithm
- Partial function application
- Particle fountain
- Partition an integer x into n primes
- Partition function P
- Pascal matrix generation
- Pascal's triangle
- Pascal's triangle/Puzzle
- Password generator
- Pathological floating point problems
- Peaceful chess queen armies
- Peano curve
- Pell numbers
- Pell's equation
- Penney's game
- Penta-power prime seeds
- Pentagram
- Pentomino tiling
- Percentage difference between images
- Percolation/Bond percolation
- Percolation/Mean cluster density
- Percolation/Mean run density
- Percolation/Site percolation
- Perfect numbers
- Perfect shuffle
- Perfect totient numbers
- Periodic table
- Peripheral drift illusion
- Perlin noise
- Permutation test
- Permutations
- Permutations by swapping
- Permutations/Derangements
- Permutations/Rank of a permutation
- Pernicious numbers
- Phrase reversals
- Pi
- Pick random element
- Pierpont primes
- Pig the dice game
- Pig the dice game/Player
- Pinstripe/Display
- Pinstripe/Printer
- Pisano period
- Plasma effect
- Play recorded sounds
- Playfair cipher
- Playing cards
- Plot coordinate pairs
- Pointers and references
- Poker hand analyser
- Polymorphic copy
- Polymorphism
- Polynomial long division
- Polynomial regression
- Polyspiral
- Population count
- Power set
- Pragmatic directives
- Price fraction
- Primality by Wilson's theorem
- Primality by trial division
- Prime conspiracy
- Prime decomposition
- Prime numbers whose neighboring pairs are tetraprimes
- Prime triangle
- Primes - allocate descendants to their ancestors
- Primes: n*2^m+1
- Primorial numbers
- Priority queue
- Probabilistic choice
- Problem of Apollonius
- Product of min and max prime factors
- Program name
- Program termination
- Proper divisors
- Pseudo-random numbers/Combined recursive generator MRG32k3a
- Pseudo-random numbers/Middle-square method
- Pseudo-random numbers/PCG32
- Pseudo-random numbers/Splitmix64
- Pseudo-random numbers/Xorshift star
- Pythagoras tree
- Pythagorean quadruples
- Pythagorean triples
Q
- QR decomposition
- Quad-power prime seeds
- Quaternion type
- Queue/Definition
- Queue/Usage
- Quickselect algorithm
- Quine
- Quoting constructs
R
- RCRPG
- RIPEMD-160
- RPG attributes generator
- RSA code
- Radical of an integer
- Ramanujan primes/twins
- Ramanujan's constant
- Ramer-Douglas-Peucker line simplification
- Random Latin squares
- Random number generator (device)
- Random number generator (included)
- Random numbers
- Random sentence from book
- Range consolidation
- Range expansion
- Range extraction
- Ranking methods
- Rare numbers
- Rate counter
- Ray-casting algorithm
- Read a configuration file
- Read a file character by character/UTF8
- Read a file line by line
- Read a specific line from a file
- Read entire file
- Real constants and functions
- Recaman's sequence
- Record sound
- Reduced row echelon form
- Reflection/Get source
- Reflection/List methods
- Reflection/List properties
- Regular expressions
- Remove duplicate elements
- Remove lines from a file
- Rename a file
- Rendezvous
- Rep-string
- Repeat
- Repeat a string
- Repunit primes
- Resistor mesh
- Respond to an unknown method call
- Retrieve and search chat history
- Return multiple values
- Reverse a string
- Reverse words in a string
- Rhonda numbers
- Riordan numbers
- Rock-paper-scissors
- Roman numerals/Decode
- Roman numerals/Encode
- Roots of a function
- Roots of a quadratic function
- Roots of unity
- Rosetta Code/Count examples
- Rosetta Code/Find bare lang tags
- Rosetta Code/Find unimplemented tasks
- Rosetta Code/Fix code tags
- Rosetta Code/Rank languages by number of users
- Rosetta Code/Rank languages by popularity
- Rot-13
- Round-robin tournament schedule
- Run-length encoding
- Runge-Kutta method
- Runtime evaluation
- Runtime evaluation/In an environment
- Ruth-Aaron numbers
S
- S-expressions
- SEDOLs
- SHA-1
- SHA-256
- SHA-256 Merkle tree
- SOAP
- SQL-based authentication
- Safe addition
- Safe primes and unsafe primes
- Sailors, coconuts and a monkey problem
- Same fringe
- Scope modifiers
- Scope/Function names and labels
- Search a list
- Search a list of records
- Search in paragraph's text
- Secure temporary file
- Selectively replace multiple instances of a character within a string
- Self numbers
- Self-describing numbers
- Semiprime
- Semordnilap
- Send an unknown method call
- Send email
- Sequence of non-squares
- Sequence of primes by trial division
- Sequence of primorial primes
- Sequence: nth number with exactly n divisors
- Sequence: smallest number greater than previous term with exactly n divisors
- Sequence: smallest number with exactly n divisors
- Set
- Set consolidation
- Set of real numbers
- Set puzzle
- Set right-adjacent bits
- Set, the card game
- Seven-sided dice from five-sided dice
- Sexy primes
- Shell one-liner
- Shoelace formula for polygonal area
- Short-circuit evaluation
- Shortest common supersequence
- Show ASCII table
- Show the epoch
- Sierpinski arrowhead curve
- Sierpinski carpet
- Sierpinski pentagon
- Sierpinski square curve
- Sierpinski triangle
- Sierpinski triangle/Graphical
- Sieve of Eratosthenes
- Sieve of Pritchard
- Simple database
- Simple turtle graphics
- Simple windowed application
- Simulate input/Keyboard
- Simulate input/Mouse
- Singleton
- Singly-linked list/Element definition
- Singly-linked list/Element insertion
- Singly-linked list/Traversal
- Singular value decomposition
- Sisyphus sequence
- Sleep
- Sleeping Beauty problem
- Smallest number k such that k+2^m is composite for all m less than k
- Smarandache prime-digital sequence
- Smarandache-Wellin primes
- Smith numbers
- Snake
- Sockets
- Sokoban
- Soloway's recurring rainfall
- Solve a Hidato puzzle
- Solve a Holy Knight's tour
- Solve a Hopido puzzle
- Solve a Numbrix puzzle
- Solve the no connection puzzle
- Sorensen–Dice coefficient
- Sort a list of object identifiers
- Sort an array of composite structures
- Sort an integer array
- Sort an outline at every level
- Sort disjoint sublist
- Sort numbers lexicographically
- Sort stability
- Sort three variables
- Sort using a custom comparator
- Sorting Algorithms/Circle Sort
- Sorting algorithms/Bead sort
- Sorting algorithms/Bogosort
- Sorting algorithms/Bubble sort
- Sorting algorithms/Cocktail sort
- Sorting algorithms/Cocktail sort with shifting bounds
- Sorting algorithms/Comb sort
- Sorting algorithms/Counting sort
- Sorting algorithms/Gnome sort
- Sorting algorithms/Heapsort
- Sorting algorithms/Insertion sort
- Sorting algorithms/Merge sort
- Sorting algorithms/Pancake sort
- Sorting algorithms/Patience sort
- Sorting algorithms/Permutation sort
- Sorting algorithms/Quicksort
- Sorting algorithms/Radix sort
- Sorting algorithms/Selection sort
- Sorting algorithms/Shell sort
- Sorting algorithms/Sleep sort
- Sorting algorithms/Stooge sort
- Sorting algorithms/Strand sort
- Soundex
- Sparkline in unicode
- Special characters
- Special variables
- Speech synthesis
- Spelling of ordinal numbers
- Sphenic numbers
- Spinning rod animation/Text
- Spiral matrix
- Split a character string based on change of character
- Square but not cube
- Square form factorization
- Square-free integers
- Stable marriage problem
- Stack
- Stack traces
- Stair-climbing puzzle
- Start from a main routine
- State name puzzle
- Statistics/Basic
- Statistics/Normal distribution
- Steffensen's method
- Stem-and-leaf plot
- Stern-Brocot sequence
- Stirling numbers of the first kind
- Stirling numbers of the second kind
- Straddling checkerboard
- Strassen's algorithm
- Stream merge
- String append
- String case
- String comparison
- String concatenation
- String interpolation (included)
- String length
- String matching
- String prepend
- Strip a set of characters from a string
- Strip block comments
- Strip comments from a string
- Strip control codes and extended characters from a string
- Strip whitespace from a string/Top and tail
- Strong and weak primes
- Sub-unit squares
- Subleq
- Substitution cipher
- Substring
- Substring/Top and tail
- Subtractive generator
- Successive prime differences
- Sudan function
- Sudoku
- Suffixation of decimal numbers
- Sum and product of an array
- Sum and product puzzle
- Sum digits of an integer
- Sum multiples of 3 and 5
- Sum of a series
- Sum of elements below main diagonal of matrix
- Sum of squares
- Sum to 100
- Summarize and say sequence
- Summarize primes
- Super-Poulet numbers
- Super-d numbers
- Superellipse
- Superpermutation minimisation
- Sutherland-Hodgman polygon clipping
- Sylvester's sequence
- Symmetric difference
- Synchronous concurrency
- System time
T
- Table creation/Postal addresses
- Take notes on the command line
- Tarjan
- Tau function
- Tau number
- Taxicab numbers
- Teacup rim text
- Temperature conversion
- Terminal control/Clear the screen
- Terminal control/Coloured text
- Terminal control/Cursor movement
- Terminal control/Cursor positioning
- Terminal control/Dimensions
- Terminal control/Display an extended character
- Terminal control/Hiding the cursor
- Terminal control/Inverse video
- Terminal control/Positional read
- Terminal control/Preserve screen
- Terminal control/Ringing the terminal bell
- Terminal control/Unicode output
- Ternary logic
- Test a function
- Test integerness
- Text processing/1
- Text processing/2
- Text processing/Max licenses in use
- Textonyms
- The Name Game
- The Twelve Days of Christmas
- The sieve of Sundaram
- Thiele's interpolation formula
- Thue-Morse
- Tic-tac-toe
- Time a function
- Tokenize a string
- Tokenize a string with escaping
- Tonelli-Shanks algorithm
- Top rank per group
- Topic variable
- Topological sort
- Topswops
- Total circles area
- Totient function
- Towers of Hanoi
- Trabb Pardo–Knuth algorithm
- Transliterate English text using the Greek alphabet
- Tree datastructures
- Tree from nesting levels
- Tree traversal
- Trigonometric functions
- Tropical algebra overloading
- Truncatable primes
- Truncate a file
- Truth table
- Tupper's self-referential formula
- Twelve statements
- Twin primes
- Two bullet roulette
- Two's complement
U
- UPC
- URL decoding
- URL encoding
- URL parser
- UTF-8 encode and decode
- Ukkonen’s suffix tree construction
- Ulam spiral (for primes)
- Ultra useful primes
- Unbias a random generator
- Undefined values
- Undulating numbers
- Unicode strings
- Unicode variable names
- Universal Lambda Machine
- Universal Turing machine
- Unix/ls
- Unprimeable numbers
- Untouchable numbers
- Update a configuration file
- Use another language to call a function
- User input/Graphical
- User input/Text
V
- Validate International Securities Identification Number
- Vampire number
- Van Eck sequence
- Van der Corput sequence
- Variable declaration reset
- Variable size/Get
- Variable size/Set
- Variable-length quantity
- Variables
- Variadic fixed-point combinator
- Variadic function
- Vector
- Vector products
- Verhoeff algorithm
- Verify distribution uniformity/Chi-squared test
- Verify distribution uniformity/Naive
- Video display modes
- Vigenère cipher
- Vigenère cipher/Cryptanalysis
- Visualize a tree
- Vogel's approximation method
- Voronoi diagram
W
- Wagstaff primes
- Walk a directory/Non-recursively
- Walk a directory/Recursively
- War card game
- Wasteful, equidigital and frugal numbers
- Water collected between towers
- Web scraping
- Weird numbers
- Wieferich primes
- Wilson primes of order n
- Window creation
- Window creation/X11
- Window management
- Wireworld
- Word frequency
- Word ladder
- Word search
- Word wheel
- Word wrap
- Wordiff
- Wordle comparison
- World Cup group stage
- Worthwhile task shaving
- Write entire file
- Write float arrays to a text file
- Write language name in 3D ASCII
- Write to Windows event log
X
Y
Z
- Zebra puzzle
- Zeckendorf arithmetic
- Zeckendorf number representation
- Zero to the zero power
- Zhang-Suen thinning algorithm
- Zig-zag matrix
- Zsigmondy numbers
- Zumkeller numbers
Draft tasks not implemented in Reduce
1
3
A
- A* search algorithm
- ABC words
- ASCII control characters
- Addition chains
- Addition-chain exponentiation
- Air mass
- Alternade words
- Anaprimes
- Append numbers at same position in strings
- Apéry's constant
- Arithmetic coding/As a generalized change of radix
- Aspect oriented programming
- Assertions in design by contract
- Audio alarm
- Audio frequency generator
- Audio overlap loop
- Autogram checker
B
- B-spline
- Bacon cipher
- Banker's algorithm
- Base 16 numbers needing a to f
- Base58Check encoding
- Base64 encode data
- Bilinear interpolation
- Binary coded decimal
- Binomial transform
- Bioinformatics/Subsequence
- Birthday problem
- Black box
- Blackjack strategy
- Boids
- Brace expansion using ranges
C
- CLI-based maze-game
- CORDIC
- Calmo numbers
- CalmoSoft primes
- Card shuffles
- Carmichael lambda function
- Centroid of a set of N-dimensional points
- Change e letters to i in words
- Changeable words
- Chebyshev coefficients
- Checksumcolor
- Chemical calculator
- Chess player
- Cipolla's algorithm
- Code Golf: Code Golf
- Code segment unload
- Collect and sort square numbers in ascending order from three lists
- Color separation
- Combinations with repetitions/Square digit chain
- Common list elements
- Common sorted list
- Compiler/Preprocessor
- Compiler/Simple file inclusion pre processor
- Compiler/Verifying syntax
- Concatenate two primes is also prime
- Conjugate a Latin verb
- Consistent overhead byte stuffing
- Continued fraction convergents
- Convert CSV records to TSV
- Coprime triplets
- Coprimes
- Count how many vowels and consonants occur in a string
- Count the coins/0-1
- Countdown
- Cousin primes
- Create an executable for a program in an interpreted language
- Create an object/Native demonstration
- Create your own text control codes
- Cross compilation
- Cubic special primes
- Curve that touches three points
- Cycle detection
D
- Data Encryption Standard
- Dating agency
- Day of the week of Christmas and New Year
- Days between dates
- Decimal floating point number to binary
- Decision tables
- Digit fifth powers
- Diophantine linear system solving
- Discrete Fourier transform
- Distinct palindromes within decimal numbers
- Distinct power numbers
- Divide a rectangle into a number of unequal triangles
- Double Twin Primes
- Doubly-linked list/Element removal
- Draw pixel 2
E
- Eisenstein primes
- Elevator simulation
- Engel expansion
- English cardinal anagrams
- Erdős-primes
- Erdős–Woods numbers
- Even numbers which cannot be expressed as the sum of two twin primes
- Exactly three adjacent 3 in lists
- Execute CopyPasta Language
- Exponential digital sums
- Extended Straddling Checkerboard
- External sort
- Extra primes
- Extract file extension
- Extreme primes
F
- Factor-perfect numbers
- Fibonacci heap
- Fibonacci matrix-exponentiation
- Find URI in text
- Find adjacent primes which differ by a square integer
- Find first and last set bit of a long integer
- Find first missing positive
- Find minimum number of coins that make a given value
- Find prime n such that reversed n is also prime
- Find prime numbers of the form n*n*n+2
- Find square difference
- Find squares n where n+1 is prime
- Find words which contain the most consonants
- Find words which contains all the vowels
- Find words which contains more than 3 e vowels
- Find words whose first and last three letters are equal
- Find words with alternating vowels and consonants
- Finite state machine
- First 9 prime Fibonacci number
- Forbidden numbers
- Four sides of square
- Free polyominoes enumeration
- Frobenius numbers
G
- Generalised floating point addition
- Generalised floating point multiplication
- Generate random numbers without repeating a value
- Geohash
- Geometric algebra
- Getting the number of decimal places
- Goodstein Sequence
- Gradient descent
- Greed
H
I
- IPC via named pipe
- IRC gateway
- Iccanobif primes
- Implicit type conversion
- Inner classes
- Input/Output for lines of text
- Input/Output for pairs of numbers
- Integer long division
- Integer roots
- Interactive help
- Inventory sequence
- Iterators
J
K
L
- L-system
- Lagrange Interpolation
- Largest difference between adjacent primes
- Largest five adjacent number
- Largest palindrome product
- Largest prime factor
- Largest product in a grid
- Last list item
- Latin Squares in reduced form/Randomizing using Jacobson and Matthews' technique
- Launch rocket with countdown and acceleration in stdout
- Least m such that n! + m is prime
- Length of an arc between two angles
- Line circle intersection
- Linux CPU utilization
- Long stairs
- Longest common prefix
- Longest common suffix
- Longest palindromic substrings
- Longest substrings without repeating characters
- Lucas-Carmichael numbers
M
- Magic numbers
- Make a backup file
- Marching squares
- Markov chain text generator
- Matrix with two diagonals
- Maximum difference between adjacent elements of list
- Mersenne primes
- Minimum number of cells after, before, above and below NxN squares
- Minimum numbers of three lists
- Minimum primes
- Modulinos
- Montgomery reduction
- Morpion solitaire
- Mosaic matrix
- Most frequent k chars distance
- Multidimensional Newton-Raphson method
- Multiline shebang
- Multiplicatively perfect numbers
- Multiton
N
- N-body problem
- N-grams
- N-queens minimum and knights and bishops
- NYSIIS
- Names to numbers
- Native shebang
- Neighbour primes
- Next special primes
- Nice primes
- Nimber arithmetic
- Number triplets game
- Numbers divisible by their individual digits, but not by the product of their digits.
- Numbers in base 10 that are palindromic in bases 2, 4, and 16
- Numbers in base-16 representation that cannot be written with decimal digits
- Numbers whose binary and ternary digit sums are prime
- Numbers whose count of divisors is prime
- Numbers with prime digits whose sum is 13
- Numbers with same digit set in base 10 and base 16
- Numeric separator syntax
- Numerical integration/Adaptive Simpson's method
O
- Odd and square numbers
- Odd squarefree semiprimes
- Odd words
- One-two primes
- OpenGL pixel shader
- OpenGL/Utah teapot
- Orbital elements
- Ormiston pairs
- Overloaded operators
P
- Palindromic primes
- Palindromic primes in base 16
- Pandigital prime
- Parse EBNF
- Parse command-line arguments
- Particle swarm optimization
- Penholodigital squares
- Penrose tiling
- Perceptron
- Permutations with repetitions
- Permutations with some identical elements
- Permuted multiples
- Piprimes
- Polynomial derivative
- Polynomial synthetic division
- Posit numbers/decoding
- Posit numbers/encoding
- Positive decimal integers with the digit 1 occurring exactly twice
- Powerful numbers
- Practical numbers
- Price list behind API
- Prime numbers p for which the sum of primes less than or equal to p is prime
- Prime numbers which contain 123
- Prime reciprocal sum
- Prime triplets
- Prime words
- Primes which contain only one odd digit
- Primes whose first and last number is 3
- Primes whose sum of digits is 25
- Primes with digits in nondecreasing order
- Print debugging statement
- Print itself
- Process SMIL directives in XML data
- Product of divisors
- Proof
- Protecting Memory Secrets
- Pseudorandom number generator image
Q
R
- Railway circuit
- Rainbow
- Ramanujan primes
- Ramsey's theorem
- Range modifications
- Raster bars
- Readline interface
- Recursive descent parser generator
- Red black tree sort
- Remote agent/Agent interface
- Remote agent/Agent logic
- Remote agent/Simulation
- Remove vowels from a string
- Resistance calculator
- Resistance network calculator
- Reverse the gender of a string
- Reverse the order of lines in a text file while preserving the contents of each line
- Rice coding
- Robots
- Rodrigues’ rotation formula
- Roots of a cubic polynomial
- Rosetta Code/List authors of task descriptions
- Rosetta Code/Run examples
- Rosetta Code/Tasks without examples
- Run as a daemon or service
S
- SEND + MORE = MONEY
- Safe and Sophie Germain primes
- Safe mode
- Sanitize user input
- Sattolo cycle
- Sealed classes and methods
- Segmentation fault protection
- Selection bias in clinical sciences
- Selective file copy
- Self-hosting compiler
- Separate the house number from the street name
- Shift list elements to left by 3
- Show the (decimal) value of a number of 1s appended with a 3, then squared
- Sierpinski curve
- Simulated annealing
- Simulated optics experiment/Data analysis
- Simulated optics experiment/Simulator
- Sine wave
- Singly-linked list/Element removal
- Singly-linked list/Reversal
- Smallest enclosing circle problem
- Smallest multiple
- Smallest numbers
- Smallest power of 6 whose decimal expansion contains n
- Smallest square that begins with n
- Snake and ladder
- Solve a Rubik's cube
- Solve equations with substitution method
- Solve hanging lantern problem
- Solve triangle solitaire puzzle
- Solving coin problems
- Sort primes from list to a list
- Sort the letters of string in alphabetical order
- Sorting algorithms/Cycle sort
- Sorting algorithms/Tree sort on a linked list
- Special divisors
- Special factorials
- Special neighbor primes
- Special pythagorean triplet
- Spoof game
- Square root by hand
- Starting a web browser
- Statistics/Chi-squared distribution
- Steady squares
- Strange numbers
- Strange plus numbers
- Strange unique prime triplets
- Sturmian word
- Subset sum problem
- Substring primes
- Suffix tree
- Sum data type
- Sum of divisors
- Sum of first n cubes
- Sum of primes in odd positions is prime
- Sum of square and cube digits of an integer are primes
- Sum of the digits of n is substring of n
- Sum of two adjacent numbers are primes
- Summation of primes
- Sunflower fractal
- Syntax highlighting using Mediawiki formatting
- Szymański's algorithm
T
- Table creation
- Tamagotchi emulator
- Terminal control/Restricted width positional input/No wrapping
- Terminal control/Restricted width positional input/With wrapping
- Tetris
- Text between
- Text completion
- Text to HTML
- The ISAAC cipher
- Three word location
- Time-based one-time password algorithm
- Topological sort/Extracted top item
- Transportation problem
- Triangular numbers
- Triplet of three numbers
- Two identical strings
- Two sum
- Type detection
U
- URL shortener
- Ulam numbers
- Unicode polynomial equation
- Unique characters
- Unique characters in each string
- Unit testing
- Uno (card game)
- Untrusted environment
- Upside-down numbers
- Use a REST API
- Useless instructions
- User defined pipe and redirection operators
- Using a speech engine to highlight words
V
W
- Walsh matrix
- Wave function collapse
- Waveform analysis/Doh ray me
- Waveform analysis/Top and tail
- Weather routing
- WebGL rotating F
- Welch's t-test
- WiktionaryDumps to words
- Wolstenholme numbers
- Word break problem
- Words containing "the" substring
- Words from neighbour ones
X
Tasks omitted from Reduce
End of List
Again, feel free to try your hand at any of the tasks listed on this page.
This category currently contains no pages or media.