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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.

Several elements can be accessed all at once:

> x=;
> x
> x(3:6)
> x(3:6:2)
> x(6:3:-2)

Arbitrary elements

> x=,]
> x
,]
> x(,)
,]
> list=where(1<x)
> list
> y=x(list)
> y

Pseudo-index

Like "theading" in PDL and "broadcasting" in Numpy, Yorick has a mechanism to do this:

> x=
> x
> y=,]
> y
,]
> y(-,)
,,],,,]]
> x(-,)
,,]
> x(,-)
]
> x(,-)/y
,]
> y=,]
> x(,-)/y
,]

Rubber index

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

> x=,]
> x
,]
> x(..,1)
> x(1,..)
> x(2,..,2)
5

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

> x(*)

Tensor multiplication

Tensor multiplication is done as follows in Yorick:

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

means ${\displaystyle \sum _{j=1}^{j=N}{P_{ijkl}Q_{mnj}}}$

> x=,]
> x
,]
> y=,,]
> x(,+)*y(+,)
,,]
> x(+,)*y(,+)
,]

External links

• Linux Journal Review
• Yorick tutorial on JehTech

• Array programming languages
• Free and open source interpreters
• Lawrence Livermore National Laboratory
• Programming languages created in 1996