# Reports:Tasks not implemented in Haskell

**Awareness**

If

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

## Contents

## Not implemented[edit]

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

### B

### C

- Canny edge detector
- Chernick's Carmichael numbers
- Cistercian numerals
- Color of a screen pixel
- Color wheel
- Colour pinstripe/Display
- Colour pinstripe/Printer
- Compiler/AST interpreter
- Compiler/code generator
- Compiler/syntax analyzer
- Compiler/virtual machine interpreter
- Composite numbers k with no single digit factors whose factors are all substrings of k
- Curzon numbers

### D

### E

### M

### N

### P

- P-value correction
- Pancake numbers
- Particle fountain
- Pathological floating point problems
- Peaceful chess queen armies
- Peano curve
- Pell numbers
- Pentomino tiling
- Periodic table
- Peripheral drift illusion
- Perlin noise
- Pinstripe/Display
- Pinstripe/Printer
- Plasma effect
- Play recorded sounds
- Polymorphic copy
- Pragmatic directives
- Prime triangle

### R

- Ramanujan primes/twins
- Ramer-Douglas-Peucker line simplification
- Random sentence from book
- Rare numbers
- Record sound
- Reflection/Get source
- Reflection/List methods
- Reflection/List properties
- Rendezvous
- Repunit primes
- Respond to an unknown method call
- Retrieve and search chat history
- Rhonda numbers
- Rosetta Code/Fix code tags
- Rosetta Code/Rank languages by number of users

### S

- SOAP
- SQL-based authentication
- Safe addition
- Search in paragraph's text
- Send an unknown method call
- Set right-adjacent bits
- Sierpinski arrowhead curve
- Sierpinski square curve
- Simple turtle graphics
- Simulate input/Keyboard
- Simulate input/Mouse
- Smallest number k such that k+2^m is composite for all m less than k
- Solve a Hopido puzzle
- Solve a Numbrix puzzle
- Sorting algorithms/Cocktail sort with shifting bounds
- Square form factorization
- Stack traces
- Strassen's algorithm
- Suffixation of decimal numbers
- Superpermutation minimisation

### T

### V

### 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 Haskell (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
- Camel case and snake case
- Card shuffles
- Changeable words
- Chebyshev coefficients
- Checksumcolor
- Chess player
- Cipolla's algorithm
- Code Golf: Code Golf
- Code segment unload
- Collect and sort square numbers in ascending order from three lists
- Combinations with repetitions/Square digit chain
- Compiler/Preprocessor
- Compiler/Simple file inclusion pre processor
- Compiler/Verifying syntax
- Conjugate a Latin verb
- Continued fraction/Arithmetic/G(matrix ng, continued fraction n)
- Continued fraction/Arithmetic/G(matrix ng, continued fraction n1, continued fraction n2)
- Count the coins/0-1
- 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
- Cycles of a permutation

### D

- Data Encryption Standard
- Dating agency
- Day of the week of Christmas and New Year
- Decision tables
- Digit fifth powers
- Diophantine linear system solving
- Discrete Fourier transform
- Distinct palindromes within decimal numbers
- Distribution of 0 digits in factorial series
- Divide a rectangle into a number of unequal triangles
- Doubly-linked list/Element removal
- Draw pixel 2

### E

### F

- Factorial primes
- Fibonacci heap
- Find URI in text
- Find adjacent primes which differ by a square integer
- Find first and last set bit of a long integer
- Find prime numbers of the form n*n*n+2
- Find squares n where n+1 is prime
- Find words which contains all the vowels
- Find words whose first and last three letters are equal
- First 9 prime Fibonacci number

### G

### I

### L

- Largest difference between adjacent primes
- Largest five adjacent number
- Largest palindrome product
- Largest prime factor
- Largest product in a grid
- Last list item
- Launch rocket with countdown and acceleration in stdout
- Logistic curve fitting in epidemiology
- Long stairs
- Longest substrings without repeating characters

### M

### N

- N-body problem
- N-queens minimum and knights and bishops
- NYSIIS
- Native shebang
- Neighbour primes
- Next special primes
- Nice primes
- Nimber arithmetic
- Number triplets game
- Numbers in base 10 that are palindromic in bases 2, 4, and 16
- Numbers whose count of divisors is prime
- Numeric separator syntax
- Numerical integration/Adaptive Simpson's method

### O

### P

- Palindromic primes in base 16
- Pan base non-primes
- Pandigital prime
- Parse command-line arguments
- Particle swarm optimization
- Penrose tiling
- Perceptron
- Permuted multiples
- Piprimes
- 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 triplets
- Prime words
- 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
- Pseudorandom number generator image

### R

- Railway circuit
- 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
- Resistance calculator
- Resistance network calculator
- Robots
- Rodrigues’ rotation formula
- Rosetta Code/List authors of task descriptions
- Rosetta Code/Run examples
- Rosetta Code/Tasks without examples
- Round-robin tournament schedule
- Run as a daemon or service

### S

- Safe and Sophie Germain primes
- Safe mode
- Sanitize user input
- Segmentation fault protection
- Selective file copy
- Self-hosting compiler
- Sierpinski curve
- Simulated annealing
- Sine wave
- Singly-linked list/Element removal
- Smallest enclosing circle problem
- Smallest numbers
- Snake and ladder
- Solve a Rubik's cube
- Solve equations with substitution method
- Solve hanging lantern problem
- Solve triangle solitare puzzle
- Solving coin problems
- Sort primes from list to a list
- Sorting algorithms/Cycle sort
- Special divisors
- Special factorials
- Special neighbor primes
- Special pythagorean triplet
- Spoof game
- Square root by hand
- Starting a web browser
- Strange unique prime triplets
- Substring primes
- Suffix tree
- Sum data type
- Sum of primes in odd positions is prime
- Sum of two adjacent numbers are primes
- Sunflower fractal

### T

- Table creation
- 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
- Transliterate English text using the Greek alphabet
- Transportation problem
- Triplet of three numbers
- Type detection

### U

### W

## Requiring Attention[edit]

### Examples[edit]

These tasks have implementations in Haskell, 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 Haskell which require attention; with your knowledge and assistance, we can improve the quality of the site's content.

### No pages found.

## Not Considered[edit]

These tasks are not generally counted toward "unimplemented", as somebody, somewhere, decided that Haskell was inappropriate for these tasks, or implementations of them would be unenlightening. Feel free to try your hand at them anyway.

### D

## End of List[edit]

Again, feel free to try your hand at any of the tasks listed on this page.