listlist ref

#(listlist-ref m col row) listlist-ref obtains a value from a matrix (list of lists).

Parameter	Description
m	Matrix (list of lists)
row	Row number (0..n-1)
col	Column number (0..n-1)

Example

Example 1: Make a matrix, obtain a value, change a value and look at the result

> (define mat '((1 2 3) (4 5 6)))
> (listlist-ref mat 1 1)
5
> (listlist-set! mat 1 1 88)
((1 2 3) (4 88 6))