# Reports:Tasks not implemented in Ruby

**Awareness**

If

**Ruby**is a language you like, or are interested in, please inform your fellow members of the Ruby community; this page can't be emptied without your and their participation.

## Contents

## Not implemented[edit]

These are currently not implemented in Ruby. Please implement some if you can. If any tasks are not possible or too complex in Ruby, they should not be on this list. To mark a task as such, add **{{omit from|Ruby}}**, preserving the capitalization of the language, to that task. It will appear below under the "Not Considered" section.

### A

### C

- Calkin-Wilf sequence
- Canny edge detector
- Catmull–Clark subdivision surface
- Chaos game
- Check Machin-like formulas
- Chernick's Carmichael numbers
- Circular primes
- Color quantization
- Colour pinstripe/Display
- Colour pinstripe/Printer
- Commatizing numbers
- Compiler/AST interpreter
- Compiler/code generator
- Compiler/lexical analyzer
- Compiler/syntax analyzer
- Compiler/virtual machine interpreter
- Copy stdin to stdout
- Cyclotomic polynomial

### D

### E

### F

### G

### I

### K

### L

### M

- MD5/Implementation
- Machine code
- Main step of GOST 28147-89
- Mastermind
- Matrix chain multiplication
- Matrix digital rain
- Mayan numerals
- Merge and aggregate datasets
- Metallic ratios
- Minimal steps down to 1
- Minkowski question-mark function
- Modified random distribution
- Monads/Writer monad
- Multi-dimensional array
- Musical scale

### N

### P

- P-Adic numbers, basic
- P-Adic square roots
- Padovan n-step number sequences
- Parallel brute force
- Parallel calculations
- Partition function P
- Pattern matching
- Pentagram
- Percolation/Bond percolation
- Percolation/Mean cluster density
- Percolation/Mean run density
- Percolation/Site percolation
- Perlin noise
- Pierpont primes
- Pinstripe/Display
- Pinstripe/Printer
- Pisano period
- Playfair cipher
- Polyspiral
- Pragmatic directives
- Primes - allocate descendants to their ancestors

### R

### S

- SHA-256 Merkle tree
- Same fringe
- Self numbers
- Simulate input/Keyboard
- Simulate input/Mouse
- Sleeping Beauty problem
- Sort an outline at every level
- Sorting algorithms/Cocktail sort with shifting bounds
- Spelling of ordinal numbers
- Square Form Factorization
- Statistics/Normal distribution
- Strassen's algorithm
- Substitution cipher
- Suffixation of decimal numbers
- Sunflower fractal
- Superellipse

### T

### 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 Ruby (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.

### A

### B

### C

- CLI-based maze-game
- Change e letters to i in words
- Changeable words
- Checksumcolor
- Chess player
- Cipolla's algorithm
- Code segment unload
- Common list elements
- Common sorted list
- Compiler/Simple file inclusion pre processor
- Compiler/Verifying syntax
- Consecutive Primes With Ascending Or Descending Differences
- Continued fraction/Arithmetic/G(matrix ng, continued fraction n1, continued fraction n2)
- Coprime triplets
- Coprimes
- Count how many vowels and consonants occur in a string
- Count the coins/0-1
- Cousin primes
- Cubic Special Primes
- Curve that touches three points
- Cyclops numbers

### D

### F

- Fibonacci heap
- Fibonacci matrix-exponentiation
- Find first missing positive
- Find prime n for that reversed n is also prime
- Find prime numbers of the form n*n*n+2
- Find words which contains all the vowels
- Find words which contains more than 3 e vowels
- Find words which contains most consonants
- Find words which first and last three letters are equals
- Finite state machine
- Frobenius numbers

### G

### L

### M

### N

- N-body problem
- NYSIIS
- Neighbour primes
- Next special primes
- Nice primes
- Numbers divisible by their individual digits, but not by the product of their digits.
- Numbers in base-16 representation that cannot be written with decimal digits
- Numbers in base 10 that are palindromic in bases 2, 4, and 16
- Numbers n in which number 1 occur twice
- Numbers which binary and ternary digit sum are prime
- Numbers which count of divisors is prime
- Numbers with equal rises and falls
- Numbers with same digit set in base 10 and base 16
- Numerical integration/Adaptive Simpson's method

### P

- Palindromic primes
- Palindromic primes in base 16
- Particle swarm optimization
- Penrose tiling
- Pentomino tiling
- Perceptron
- Permutations with some identical elements
- Piprimes
- Polynomial synthetic division
- Powerful numbers
- Practical numbers
- Price list behind API
- Prime numbers p which sum of prime numbers less or equal to p is prime
- Prime numbers which contain 123
- Prime triplets
- Primes which contain only one odd number
- Primes whose first and last number is 3
- Primes with digits in nondecreasing order
- Print debugging statement
- Print itself
- Process SMIL directives in XML data
- Pseudo-random numbers/Splitmix64
- Pseudorandom number generator image

### R

- Railway circuit
- Range modifications
- Raster bars
- Recursive descent parser generator
- Remote agent/Agent interface
- Remote agent/Agent logic
- Remote agent/Simulation
- Resistance calculator
- Resistance network calculator
- Reverse the gender of a string
- Robots
- Rosetta Code/List authors of task descriptions
- Rosetta Code/Run examples
- Rosetta Code/Tasks without examples
- Run as a daemon or service

### S

- Safe mode
- Selective file copy
- Self-hosting compiler
- Separate the house number from the street name
- Show the (decimal) value of a number of 1s appended with a 3, then squared
- Sierpinski curve
- Sierpinski square curve
- Simulated annealing
- Sine wave
- Singly-linked list/Element removal
- Smallest enclosing circle problem
- Smallest numbers
- Smallest power of 6 whose decimal expansion contains n
- Snake
- Solve a Rubik's Cube
- Solving coin problems
- Sort the letters of string in alphabetical order
- Sorting algorithms/Tree sort on a linked list
- Special Divisors
- Special factorials
- Spoof game
- Square root by hand
- Starting a web browser
- Strange unique prime triplets
- Substring primes
- Suffix tree
- Sum data type
- Sum of elements below main diagonal of matrix
- Sum of first n cubes
- Sum of the digits of n is substring of n
- Sylvester's sequence

### T

- Tamagotchi emulator
- Terminal control/Restricted width positional input/No wrapping
- Terminal control/Restricted width positional input/With wrapping
- Tetris
- Text completion
- Text to HTML
- Three word location
- Time-based one-time password algorithm
- Topological sort/Extracted top item
- Transportation problem
- Triplet of three numbers
- Twin primes
- Two bullet roulette
- Type detection

### U

### W

## Requiring Attention[edit]

### Examples[edit]

These tasks have implementations in Ruby, 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.

### C

### I

### P

### Y

### Other pages[edit]

These are other pages related to Ruby 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 Ruby 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.