# Reports:Tasks not implemented in Lua

**Awareness**

If

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

## Contents

## Not implemented[edit]

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

### A

### B

### C

- Calkin-Wilf sequence
- Canny edge detector
- Canonicalize CIDR
- Catmull–Clark subdivision surface
- Chat server
- Check Machin-like formulas
- Check input device is a terminal
- Checkpoint synchronization
- Chernick's Carmichael numbers
- Cholesky decomposition
- Closest-pair problem
- Color of a screen pixel
- Color quantization
- Color wheel
- Colour bars/Display
- Colour pinstripe/Display
- Colour pinstripe/Printer
- Combinations and permutations
- Commatizing numbers
- Compare sorting algorithms' performance
- Compiler/AST interpreter
- Compiler/code generator
- Compiler/syntax analyzer
- Compiler/virtual machine interpreter
- Conjugate transpose
- Continued fraction/Arithmetic/Construct from rational number
- Create an object at a given address
- Currency
- Cut a rectangle
- Cyclotomic polynomial

### D

### E

### F

- FTP
- Faces from a mesh
- Factorial base numbers indexing permutations of a collection
- Factorions
- Factors of a Mersenne number
- Fermat numbers
- File size distribution
- Find common directory path
- Find duplicate files
- Find largest left truncatable prime in a given base
- Find palindromic numbers in both binary and ternary bases
- First perfect square in base n with n unique digits
- First power of 2 that has leading decimal digits of 12
- Four is the number of letters in the ...
- Fractran
- Function frequency

### G

### H

### I

- Idiomatically determine all the characters that can be used for symbols
- Image convolution
- Image noise
- Imaginary base numbers
- Increasing gaps between consecutive Niven numbers
- Index finite lists of positive integers
- Inheritance/Single
- Integer overflow
- Intersecting number wheels
- Inverted index
- Inverted syntax
- Isqrt (integer square root) of X

### K

### L

### M

- Machine code
- Mad Libs
- Main step of GOST 28147-89
- Matrix digital rain
- Mayan numerals
- Maze solving
- Median filter
- Memory allocation
- Memory layout of a data structure
- Merge and aggregate datasets
- Mertens function
- Metallic ratios
- Metered concurrency
- Metronome
- Mian-Chowla sequence
- Miller–Rabin primality test
- Mind boggling card trick
- Minesweeper game
- Minimal steps down to 1
- Minkowski question-mark function
- Modular exponentiation
- Modular inverse
- Monads/List monad
- Monads/Writer monad
- Mouse position
- Multiple regression
- Multiplicative order
- Musical scale
- Mutex

### N

### O

### P

- P-value correction
- Palindrome dates
- Palindromic gapful numbers
- Paraffins
- Parallel brute force
- Parallel calculations
- Parametric polymorphism
- Parametrized SQL statement
- Parse an IP Address
- Parsing/Shunting-yard algorithm
- Partition an integer x into n primes
- Partition function P
- Pascal's triangle/Puzzle
- Pathological floating point problems
- Pattern matching
- Peaceful chess queen armies
- Pell's equation
- Pentagram
- Percolation/Bond percolation
- Percolation/Mean cluster density
- Percolation/Mean run density
- Percolation/Site percolation
- Perfect totient numbers
- Perlin noise
- Permutation test
- Permutations/Rank of a permutation
- Pig the dice game/Player
- Pinstripe/Printer
- Play recorded sounds
- Playfair cipher
- Polymorphic copy
- Polynomial long division
- Pragmatic directives
- Primality by Wilson's theorem
- Primes - allocate descendants to their ancestors
- Primorial numbers
- Problem of Apollonius
- Pseudo-random numbers/Combined recursive generator MRG32k3a
- Pseudo-random numbers/PCG32
- Pythagoras tree
- Pythagorean triples

### R

- RCRPG
- RPG attributes generator
- RSA code
- Ramanujan's constant
- Ramer-Douglas-Peucker line simplification
- Random number generator (device)
- Range consolidation
- Ranking methods
- Rare numbers
- Rate counter
- Ray-casting algorithm
- Record sound
- Rendezvous
- Rep-string
- Resistor mesh
- Retrieve and search chat history
- Rosetta Code/Count examples
- Rosetta Code/Find bare lang tags
- Rosetta Code/Rank languages by popularity
- Runge-Kutta method

### S

- SEDOLs
- SHA-256 Merkle tree
- SOAP
- SQL-based authentication
- Safe addition
- Self numbers
- 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 primorial primes
- Set consolidation
- Set puzzle
- Shortest common supersequence
- Simple database
- Simulate input/Keyboard
- Simulate input/Mouse
- Singleton
- Singly-linked list/Element definition
- Singly-linked list/Element insertion
- Singly-linked list/Traversal
- Sokoban
- Solve a Hidato puzzle
- Solve a Hopido puzzle
- Solve a Numbrix puzzle
- Solve the no connection puzzle
- Sort an outline at every level
- Sorting algorithms/Cocktail sort with shifting bounds
- Sorting algorithms/Heapsort
- Sorting algorithms/Patience sort
- Sorting algorithms/Radix sort
- Sorting algorithms/Strand sort
- Sparkline in unicode
- Speech synthesis
- Spelling of ordinal numbers
- Start from a main routine
- State name puzzle
- Stirling numbers of the first kind
- Stirling numbers of the second kind
- Stream merge
- Successive prime differences
- Suffixation of decimal numbers
- Sunflower fractal
- Superellipse
- Superpermutation minimisation

### T

- Tarjan
- Teacup rim 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/Unicode output
- Ternary logic
- The ISAAC Cipher
- Thiele's interpolation formula
- Tonelli-Shanks algorithm
- Topic variable
- Topological sort
- Total circles area
- Tree datastructures
- 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 Lua (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
- Changeable words
- Checksumcolor
- Chess player
- Cipolla's algorithm
- Code segment unload
- Combinations with repetitions/Square digit chain
- Compiler/Verifying syntax
- 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 object/Native demonstration
- Curve that touches three points

### D

### E

### F

### G

### L

### M

### N

### P

- Pancake numbers
- Parse EBNF
- Parse command-line arguments
- Particle swarm optimization
- Penrose tiling
- Pentomino tiling
- Permutations with repetitions
- 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
- Proof
- Pseudo-random numbers/Splitmix64
- Pseudorandom number generator image

### R

- Railway circuit
- Ramsey's theorem
- Random Latin squares
- Range modifications
- Raster bars
- Readline interface
- 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/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 arrowhead curve
- Sierpinski curve
- Sierpinski square curve
- Simulated annealing
- Sine wave
- Singly-linked list/Element removal
- Smallest enclosing circle problem
- Snake
- Solve a Rubik's Cube
- Solve triangle solitare puzzle
- Solving coin problems
- Sorting algorithms/Cycle sort
- Sorting algorithms/Tree sort on a linked list
- Spoof game
- Square root by hand
- Starting a web browser
- Strassen's algorithm
- Subset sum problem
- 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 between
- 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

### U

### W

## Requiring Attention[edit]

### Examples[edit]

These tasks have implementations in Lua, 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 Lua 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 Lua 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.