Use amend ( } ) to change cells once the matrix is read in ... eg
m=:i.5 5
m
0 1 2 3 4
5 6 7 8 9
10 11 12 13 14
15 16 17 18 19
20 21 22 23 24
] m=:(55)(<2;2)}m NB. Amend produces a (changed) version of m
so you need to save it back to m (or elsewhere)
0 1 2 3 4
5 6 7 8 9
10 11 55 13 14
15 16 17 18 19
20 21 22 23 24
But you need to check the reference manual, as there is a great deal
of power in amend (eg can do vector and scattered index replacement
also) so you can assign in multi instances all over the place in the
one operation.
Rob Hodgkinson
On 21/04/2009, at 7:54 AM, Charles Holder wrote:
>
> I just got Windows Vista x64. Since the APL I have is not
> compatible.
> I need to be able to read a file of numbers into an array and
> create another array and change the values in the cells.
> How can I change a cell to a specific value?
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