Reports:Tasks not implemented in Erlang
From Rosetta Code
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If Erlang is a language you like, or are interested in, please inform your fellow members of the Erlang community; this page can't be emptied without your and their participation.
If Erlang is a language you like, or are interested in, please inform your fellow members of the Erlang community; this page can't be emptied without your and their participation.
Contents
Not implemented[edit]
These are currently not implemented in Erlang. Please implement some if you can. If any tasks are not possible or too complex in Erlang, they should not be on this list. To mark a task as such, add {{omit from|Erlang}}, preserving the capitalization of the language, to that task. It will appear below under the "Not Considered" section.
A
- AVL tree
- Abbreviations, easy
- Abbreviations, simple
- Abelian sandpile model
- Abundant odd numbers
- Active Directory/Search for a user
- Add a variable to a class instance at runtime
- Aliquot sequence classifications
- Amb
- Angle difference between two bearings
- Angles (geometric), normalization and conversion
- Animate a pendulum
- Animation
- Append a record to the end of a text file
- Apply a digital filter (direct form II transposed)
- Approximate Equality
- Archimedean spiral
- Arithmetic/Rational
- Arithmetic evaluation
- Attractive numbers
- Average loop length
B
- Barnsley fern
- Base64 decode data
- Bernoulli numbers
- Bitcoin/public point to address
- 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 an image through a pipe
- Box the compass
- Brace expansion
- Break OO privacy
- Brownian tree
- Bulls and cows/Player
C
- CUSIP
- Calculating the value of e
- Calendar
- Calendar - for "REAL" programmers
- Call a foreign-language function
- Call a function in a shared library
- Call an object method
- Canny edge detector
- Cantor set
- Carmichael 3 strong pseudoprimes
- Cartesian product of two or more lists
- Casting out nines
- Catmull–Clark subdivision surface
- Chaocipher
- Chaos game
- Check Machin-like formulas
- Chinese zodiac
- Cholesky decomposition
- Chowla numbers
- Circles of given radius through two points
- Classes
- Closest-pair problem
- Collections
- Color of a screen pixel
- Color quantization
- Colour bars/Display
- Colour pinstripe/Display
- Colour pinstripe/Printer
- Commatizing numbers
- Compiler/AST interpreter
- Compiler/code generator
- Compiler/lexical analyzer
- Compiler/syntax analyzer
- Compiler/virtual machine interpreter
- Conjugate transpose
- Constrained genericity
- Constrained random points on a circle
- Continued fraction/Arithmetic/Construct from rational number
- Convert decimal number to rational
- Convex hull
- Count in factors
- Cramer's rule
- Create a file on magnetic tape
- Cuban primes
- Currency
- Cut a rectangle
D
- De Bruijn sequences
- Deal cards for FreeCell
- Death Star
- Deconvolution/1D
- Deconvolution/2D+
- Delegates
- Deming's Funnel
- Department Numbers
- Determinant and permanent
- Digital root/Multiplicative digital root
- Discordian date
- Dragon curve
- Draw a clock
- Draw a cuboid
- Draw a pixel
- Draw a rotating cube
- Draw a sphere
E
- EKG sequence convergence
- Eban numbers
- Eertree
- Element-wise operations
- Elementary cellular automaton
- Emirp primes
- Equilibrium index
- Euler's identity
- Euler's sum of powers conjecture
- Executable library
- Execute SNUSP
- Execute a Markov algorithm
- Exponentiation order
- Extend your language
- Extensible prime generator
- Extreme floating point values
F
- FASTA format
- Factorial base numbers indexing permutations of a collection
- Farey sequence
- Fast Fourier transform
- Fibonacci word
- Fibonacci word/fractal
- Find largest left truncatable prime in a given base
- Find palindromic numbers in both binary and ternary bases
- Find the intersection of two lines
- First perfect square in base N with N unique digits
- Fixed length records
- Flipping bits game
- Floyd-Warshall algorithm
- Formal power series
- Four is magic
- Four is the number of letters in the ...
- Fractal tree
- Functional coverage tree
- Fusc sequence
G
H
- HTTPS/Authenticated
- HTTPS/Client-authenticated
- Hamming numbers
- Hello world/Graphical
- Hello world/Line printer
- Heronian triangles
- Hickerson series of almost integers
- Hilbert curve
- Hofstadter Figure-Figure sequences
- Honeycombs
- Horizontal sundial calculations
- Hough transform
- Humble numbers
- Hunt The Wumpus
I
- IBAN
- Idiomatically determine all the characters that can be used for symbols
- Idiomatically determine all the lowercase and uppercase letters
- Image convolution
- Image noise
- Imaginary base numbers
- Index finite lists of positive integers
- Inheritance/Multiple
- Inheritance/Single
- Integer overflow
- Intersecting Number Wheels
- Inverted syntax
- Iterated digits squaring
K
- K-d tree
- K-means++ clustering
- Kernighans large earthquake problem
- Keyboard input/Flush the keyboard buffer
- Keyboard input/Keypress check
- Keyboard input/Obtain a Y or N response
- Keyboard macros
- Knapsack problem/Bounded
- Knapsack problem/Unbounded
- Knuth's algorithm S
- Knuth's power tree
- Koch curve
- Kolakoski sequence
- Kosaraju
- Kronecker product
- Kronecker product based fractals
L
- LU decomposition
- Largest number divisible by its digits
- Latin Squares in reduced form
- Law of cosines - triples
- Left factorials
- Leonardo numbers
- Long primes
- Longest Common Substring
- Longest string challenge
- Loops/Increment loop index within loop body
- Loops/Wrong ranges
- Loops/with multiple ranges
- Lucky and even lucky numbers
- Ludic numbers
- Lychrel numbers
M
- MAC Vendor Lookup
- MD5/Implementation
- Machine code
- Magic squares of doubly even order
- Magic squares of odd order
- Magic squares of singly even order
- Main step of GOST 28147-89
- Make directory path
- Mastermind
- Matrix-exponentiation operator
- Matrix Digital Rain
- Matrix chain multiplication
- Maximum triangle path sum
- Mayan numerals
- McNuggets Problem
- Median filter
- Memory layout of a data structure
- Menu
- Metronome
- Mian-Chowla sequence
- Mind boggling card trick
- Minesweeper game
- Modular exponentiation
- Modular inverse
- Morse code
- Mouse position
- Move-to-front algorithm
- Multi-dimensional array
- Multiple regression
- Multiplicative order
- Munchausen numbers
- Munching squares
N
- N'th
- N-smooth numbers
- Naming conventions
- Narcissist
- Narcissistic decimal number
- Natural sorting
- Nautical bell
- Negative base numbers
- Nested function
- Nested templated data
- Nim Game
- Nonoblock
- Nonogram solver
- Numeric error propagation
- Numerical and alphabetical suffixes
- Numerical integration
- Numerical integration/Gauss-Legendre Quadrature
O
P
- P-value correction
- Paraffins
- Parallel Brute Force
- Parametric polymorphism
- Parametrized SQL statement
- Parse an IP Address
- Parsing/RPN to infix conversion
- Parsing/Shunting-yard algorithm
- Partial function application
- Partition an integer X into N primes
- Pascal's triangle/Puzzle
- Pascal matrix generation
- Password generator
- Pathological floating point problems
- Peaceful chess queen armies
- Peano curve
- Pell's equation
- Penney's game
- Pentagram
- Percentage difference between images
- Percolation/Bond percolation
- Percolation/Mean cluster density
- Percolation/Mean run density
- Percolation/Site percolation
- Perfect shuffle
- Perfect totient numbers
- Permutation test
- Permutations/Derangements
- Permutations/Rank of a permutation
- Permutations by swapping
- Pernicious numbers
- Phrase reversals
- Pinstripe/Display
- Pinstripe/Printer
- Plasma effect
- Play recorded sounds
- Pointers and references
- Poker hand analyser
- Polymorphic copy
- Polymorphism
- Polynomial long division
- Polynomial regression
- Polyspiral
- Prime conspiracy
- Primes - allocate descendants to their ancestors
- Primorial numbers
- Problem of Apollonius
- Pythagoras tree
- Pythagorean quadruples
R
- RIPEMD-160
- RPG Attributes Generator
- RSA code
- Ramer-Douglas-Peucker line simplification
- Random number generator (device)
- Range consolidation
- Ranking methods
- Rare numbers
- Ray-casting algorithm
- Recaman's sequence
- Record sound
- Reduced row echelon form
- Reflection/Get source
- Reflection/List methods
- Reflection/List properties
- Rep-string
- Resistor mesh
- Respond to an unknown method call
- Retrieve and search chat history
- Reverse words in a string
- Roots of a quadratic function
- Roots of unity
- Runge-Kutta method
S
- S-Expressions
- SEDOLs
- SOAP
- SQL-based authentication
- Safe addition
- Safe primes and unsafe primes
- Sailors, coconuts and a monkey problem
- Same Fringe
- Search a list of records
- Secure temporary file
- Self-referential sequence
- Send an unknown method call
- Send email
- 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
- Sequence of primes by trial division
- Sequence of primorial primes
- Set consolidation
- Set of real numbers
- Sexy primes
- Shoelace formula for polygonal area
- Shortest common supersequence
- Show Ascii table
- Sierpinski pentagon
- Simple windowed application
- Simulate input/Keyboard
- Simulate input/Mouse
- Smarandache prime-digital sequence
- Smith numbers
- Sokoban
- Solve a Holy Knight's tour
- Solve a Hopido puzzle
- Solve a Numbrix puzzle
- Solve the no connection puzzle
- Sort a list of object identifiers
- Sort numbers lexicographically
- Sort three variables
- Sorting algorithms/Bogosort
- Sorting algorithms/Cocktail sort
- Sorting algorithms/Comb sort
- Sorting algorithms/Counting sort
- Sorting algorithms/Heapsort
- Sorting algorithms/Pancake sort
- Sorting algorithms/Patience sort
- Sorting algorithms/Permutation sort
- Sorting algorithms/Radix sort
- Sorting algorithms/Shell sort
- Sorting algorithms/Stooge sort
- Sorting algorithms/Strand sort
- Sparkline in unicode
- Speech synthesis
- Spelling of ordinal numbers
- Spinning rod animation/Text
- Spiral matrix
- Split a character string based on change of character
- Square-free integers
- Square but not cube
- Stable marriage problem
- State name puzzle
- Statistics/Basic
- Statistics/Normal distribution
- Stem-and-leaf plot
- Stern-Brocot sequence
- Straddling checkerboard
- Stream Merge
- Strip block comments
- Strong and weak primes
- Subleq
- Subtractive generator
- Successive prime differences
- Suffixation of decimal numbers
- Sum and Product Puzzle
- Sum to 100
- Sunflower fractal
- Superellipse
- Superpermutation minimisation
- Sutherland-Hodgman polygon clipping
T
- Tarjan
- Taxicab numbers
- Terminal control/Coloured text
- Terminal control/Cursor movement
- Terminal control/Cursor positioning
- Terminal control/Dimensions
- 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
- Test integerness
- Textonyms
- The ISAAC Cipher
- The Name Game
- Thiele's interpolation formula
- Thue-Morse
- Tokenize a string with escaping
- Tonelli-Shanks algorithm
- Total circles area
- Totient function
- Truncatable primes
- Truth table
- Twelve statements
U
V
W
Draft tasks without implementation[edit]
These tasks are drafts, meaning they largely need more work to turn them into full tasks. Perhaps you can help by trying to implement them in Erlang (after all, one of the key requirements for a task being non-draft is multiple implementations, preferably in widely different languages) but be aware that this may be difficult because of lack of definition of the task itself.
2
A
B
C
- Card shuffles
- Chebyshev coefficients
- Check input device is a terminal
- Check output device is a terminal
- Checksumcolor
- Chemical Calculator
- Chernick's Carmichael numbers
- Cheryl's Birthday
- Chess player
- Chess player/Move generation
- Chess player/Program options and user interface
- Chess player/Search and evaluation
- Cipolla's algorithm
- Code segment unload
- Color wheel
- Combinations with repetitions/Square Digit Chain
- Continued fraction/Arithmetic/G(matrix NG, Contined Fraction N)
- Continued fraction/Arithmetic/G(matrix NG, Contined Fraction N1, Contined Fraction N2)
- Copy stdin to stdout
- Create an object/Native demonstration
- Curve that touches three points
- Cycle detection
D
- Damm algorithm
- Data Encryption Standard
- Decimal floating point number to binary
- Decision tables
- Determine if a string has all the same characters
- Determine if a string has all unique characters
- Determine if two triangles overlap
- Dice game probabilities
- Display a linear combination
- Display an outline as a nested table
- Diversity prediction theorem
- Draw pixel 2
E
F
- Factorions
- Faulhaber's formula
- Faulhaber's triangle
- Feigenbaum constant calculation
- Fermat numbers
- Fibonacci heap
- File extension is in extensions list
- File size distribution
- Find URI in text
- Find duplicate files
- Find first and last set bit of a long integer
- Find the intersection of a line with a plane
- Finite state machine
- Fraction reduction
- Free polyominoes enumeration
- French Republican calendar
G
H
I
L
M
- Magic 8-Ball
- Make a backup file
- Markov chain text generator
- Mayan calendar
- Mersenne primes
- Metallic ratios
- Modular arithmetic
- Monads/List monad
- Monads/Maybe monad
- Monads/Writer monad
- Montgomery reduction
- Morpion solitaire
- Most frequent k chars distance
- Multidimensional Newton-Raphson method
- Musical scale
N
O
P
- Palindromic gapful numbers
- Parse EBNF
- Parse command-line arguments
- Particle Swarm Optimization
- Penrose tiling
- Pentomino tiling
- Perceptron
- Perlin noise
- Permutations with some identical elements
- Pierpont primes
- Playfair cipher
- Polynomial synthetic division
- Print debugging statement
- Process SMIL directives in XML data
- Proof
R
- Railway circuit
- Ramanujan's constant
- Random Latin Squares
- Raster bars
- Read a file character by character/UTF8
- Readline interface
- Recursive descent parser generator
- Reflection/List methods
- Remote agent/Agent interface
- Remote agent/Agent logic
- Remote agent/Simulation
- Repeat
- Resistance Calculator
- Resistance Network Calculator
- Reverse the gender of a string
- Robots
- Rosetta Code/List authors of task descriptions
- Rosetta Code/Rank languages by number of users
- Rosetta Code/Run examples
- Rosetta Code/Tasks sorted by average lines of code
- Rosetta Code/Tasks without examples
- Run as a daemon or service
S
- Safe mode
- Sattolo cycle
- Selective File Copy
- Self-hosting compiler
- Separate the house number from the street name
- Simulated annealing
- Sine wave
- Singly-linked list/Element removal
- Snake
- Snake And Ladder
- Solve a Rubik's Cube
- Solving coin problems
- Sorting Algorithms/Circle Sort
- Sorting algorithms/Cycle sort
- Sorting algorithms/Tree sort on a linked list
- Spoof game
- Starting a web browser
- Stirling numbers of the first kind
- Stirling numbers of the second kind
- Subset sum problem
- Substitution Cipher
- Suffix tree
- Sum data type
- Super-d numbers
T
- Table creation
- Tamagotchi emulator
- Teacup rim text
- Terminal control/Restricted width positional input/No wrapping
- Terminal control/Restricted width positional input/With wrapping
- Tetris
- Text between
- Text to HTML
- Time-based One-time Password Algorithm
- Topological sort/Extracted top item
- Transportation problem
- Tree datastructures
- Two Sum
- Type detection
U
W
Requiring Attention[edit]
Examples[edit]
These tasks have implementations in Erlang, but somebody, somewhere, decided that the example implementation was faulty or in some other way requiring attention. If you're familiar with the task and language, please consider reviewing/correcting the example and removing the notice.
Other pages[edit]
These are other pages related to Erlang which require attention; with your knowledge and assistance, we can improve the quality of the site's content.
Not Considered[edit]
These tasks are not generally counted toward "unimplemented", as somebody, somewhere, decided that Erlang was inappropriate for these tasks, or implementations of them would be unenlightening. Feel free to try your hand at them anyway.
End of List[edit]
Again, feel free to try your hand at any of the tasks listed on this page.
