# Yorick (programming language)

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Usual file extensions | .i |
---|---|

Appeared in | 1996 |

Designed by | David H. Munro |

Stable release | 2.1.05 (January 10, 2008) |

OS | Unix, Linux, Mac, Windows |

License | BSD |

Website | Yorick Home Page |

**Yorick** is an interpreted programming language designed for numerics, graph plotting and steering large scientific simulation codes. It is quite fast due to array syntax, and extensible via C or Fortran routines. It was created in 1996 by David H. Munro of Lawrence Livermore National Laboratory.

## Features

- Indexing

Yorick is good at manipulating elements in N-dimensional arrays conveniently with its powerful syntax.

- Range of indices

Several elements can be accessed all at once:

> x=[1,2,3,4,5,6]; > x [1,2,3,4,5,6] > x(3:6) [3,4,5,6] > x(3:6:2) [3,5] > x(6:3:-2) [6,4]

- Arbitrary elements

> x=[[1,2,3],[4,5,6]] > x [[1,2,3],[4,5,6]] > x([2,1],[1,2]) [[2,1],[5,4]] > list=where(1<x) > list [2,3,4,5,6] > y=x(list) > y [2,3,4,5,6]

- Pseudo-index

Like "theading" in PDL(Perl Data Language) and "broadcasting" in Numpy ( Numeric extension for Python), Yorick has a mechanism to do this:

> x=[1,2,3] > x [1,2,3] > y=[[1,2,3],[4,5,6]] > y [[1,2,3],[4,5,6]] > y(-,) [[[1],[2],[3]],[[4],[5],[6]]] > x(-,) [[1],[2],[3]] > x(,-) [[1,2,3]] > x(,-)/y [[1,1,1],[0,0,0]] > y=[[1.,2,3],[4,5,6]] > x(,-)/y [[1,1,1],[0.25,0.4,0.5]]

- Rubber index

".." is a rubber-index to represent zero or more dimensions of the array.

> x=[[1,2,3],[4,5,6]] > x [[1,2,3],[4,5,6]] > x(..,1) [1,2,3] > x(1,..) [1,4] > x(2,..,2) 5

"*" is a kind of rubber-index to reshape a slice(sub-array) of array to a vector.

> x(*) [1,2,3,4,5,6]

- Tensor multiplication

Tensor multiplication is done as follows in Yorick:

P(,+,,)*Q(,,+)

means <math>\sum_{j=1}^{j=N}{P_{ijkl}Q_{mnj}}</math>

> x=[[1,2,3],[4,5,6]] > x [[1,2,3],[4,5,6]] > y=[[7,8],[9,10],[11,12]] > x(,+)*y(+,) [[39,54,69],[49,68,87],[59,82,105]] > x(+,)*y(,+) [[58,139],[64,154]]

## External links

File:HelloWorld.svg | This programming language-related article is a stub. You can help Wikipedia by expanding it. |

ms:Bahasa pengaturcaraan Yorick pt:Yorick

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