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

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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