# 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

### F

- Faces from a mesh
- Factorial base numbers indexing permutations of a collection
- File size distribution
- First power of 2 that has leading decimal digits of 12
- Fixed length records
- Formal power series
- Four is the number of letters in the ...
- Function frequency
- Function prototype
- Functional coverage tree

### G

### I

### K

### M

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

### N

### P

- Parallel brute force
- Parallel calculations
- Partition function P
- Pattern matching
- Peaceful chess queen armies
- Pentagram
- Percolation/Bond percolation
- Percolation/Mean cluster density
- Percolation/Mean run density
- Percolation/Site percolation
- Perlin noise
- Pierpont primes
- Pinstripe/Display
- Pinstripe/Printer
- Playfair cipher
- Polyspiral
- Pragmatic directives
- Primes - allocate descendants to their ancestors
- Pseudo-random numbers/Combined recursive generator MRG32k3a

### R

### S

- SHA-256 Merkle tree
- Same fringe
- Self numbers
- Sequence: nth number with exactly n divisors
- Simulate input/Keyboard
- Simulate input/Mouse
- Sort an outline at every level
- Sorting algorithms/Cocktail sort with shifting bounds
- Spelling of ordinal numbers
- Statistics/Normal distribution
- Stirling numbers of the first kind
- Stirling numbers of the second kind
- 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

### E

### G

### L

### M

### N

### P

- Particle swarm optimization
- Penrose tiling
- Pentomino tiling
- Perceptron
- Permutations with some identical elements
- Pisano period
- Polynomial synthetic division
- Powerful numbers
- Price list behind API
- Prime words
- Print debugging statement
- Print itself
- Process SMIL directives in XML data
- Product of divisors
- 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
- Remove vowels from a string
- 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 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
- Sierpinski curve
- Sierpinski square curve
- Simulated annealing
- Sine wave
- Singly-linked list/Element removal
- Smallest enclosing circle problem
- Snake
- Solve a Rubik's Cube
- Solving coin problems
- Sorting algorithms/Tree sort on a linked list
- Spoof game
- Square root by hand
- Starting a web browser
- Strassen's algorithm
- Suffix tree
- Sum data type
- Sum of divisors

### T

- Tamagotchi emulator
- Tau function
- Tau number
- 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
- 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.