# Yorick (programming language)

### From Seo Wiki - Search Engine Optimization and Programming Languages

This article does not cite any references or sources.Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (October 2009) |

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