[racket] How to iterate through the arrays in a matrix?

FWIW here is one way to add the rows of a matrix:

#lang racket
(require math/matrix)

(for/fold ([result (matrix [[0 0]])])
          ([row (matrix-rows (matrix [[1 2] [3 4]]))])
  (matrix+ result row))




2014-11-28 22:41 GMT+01:00 Animesh Pandey <animeshpandey.etno at gmail.com>:
> Hi,
> I have a 80 X 4 matrix. I have iterate through each row and subtract each
> row with another array at each iteration. At first I thought to convert all
> array to list and do all the operations and then again convert the final
> list if lists to a matrix. But I somehow think that is not a suited way. I
> tried using "for*/matrix" but could not get it right. Could any one give an
> example on how to iterate a matrix (array for arrays)?
>
> My matrix looks like this:
>> (list*->matrix final-data)
> (array
>  #[#[5.1 3.5 1.4 0.2]
>    #[4.9 3.0 1.4 0.2]
>    #[4.7 3.2 1.3 0.2]
>    #[4.6 3.1 1.5 0.2]
>    #[5.0 3.6 1.4 0.2]
>    #[5.4 3.9 1.7 0.4]
>    #[4.6 3.4 1.4 0.3]
>    #[5.0 3.4 1.5 0.2]
>    #[4.4 2.9 1.4 0.2]
>    #[4.9 3.1 1.5 0.1]
> ...........
>
> Thanks!
>
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Jens Axel Søgaard