setps problem/how to set matrix elements

*To*: mathgroup at smc.vnet.net*Subject*: [mg65778] setps problem/how to set matrix elements*From*: Robert James Williamson <sparkles at stanford.edu>*Date*: Mon, 17 Apr 2006 02:28:26 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

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

**Follow-Ups**:**Re: setps problem/how to set matrix elements***From:*"Szabolcs Horvát" <szhorvat@gmail.com>