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setps problem/how to set matrix elements


I get General::setps as an error for the following:

FSD[r_, xdim_, ydim_] := Module[{}, r[[1, 1]] = 5;]

FSD[r, 256, 256] <-- This command generates the error.

Where r is defined as:

r = {{0.5, 0.5, 0.5, 0.5}, {0.5, 0.5, 0.5, 0.5}, {0.5,
       0.5, 0.5, 0.5}, {0.5, 0.5, 0.5, 0.5}};

I'm confused because I have no problem when I type in:

r[[1,1]] = 5

This correctly sets the 1,1 entry of the matrix to 5.

Any input on this? Or point me to the FAQ?

Kind regards, and many thanks.

Rob


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