2012/12/8 Danny Yoo <d...@hashcollision.org>:
>> Or maybe using a : or something to separate rows for 2D arrays?
>> (array 1 2 : 3 4)
The matrix library uses arrays to represent the matrices.
An 2x3 matrix can be constructed as:
(matrix/dim 2 3
1 2 3
4 5 6)
(list->matrix '[[1 2 3] [4 5 6]])
(for/matrix: : Number 2 3 ([i (in-naturals)]) i)
These expressions will all return the same 2D array.
Given that the shape of a matrix is fixed, the problems
with square parentheses in constructor notation disappear.
That is, one could let matrix be a macro, and it could
accept both kinds of parentheses:
(matrix [[1 2 3] [4 5 6]])
(matrix ((1 2 3) (4 5 6)))
See more matrix examples here:
https://github.com/plt/racket/blob/master/collects/math/tests/matrix-tests.rkt
--
Jens Axel Søgaard
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