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Re: matrix

"Su Su Win" <susuwin at> wrote in message
news:9bb759$92p at
> Hello,
> How can I make a matrix (4000x1220) with zeros except that all the values
> 216th to 220th rows are ones.

Here is the basic idea (scaled down):

Table[If[y > 3 && y < 7,1,0],{y,1,16},{x,1,16}]//MatrixForm

Paul Lutus

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