MATLAB Central Newsreader - Fill a matrix

Fill a matrix

Flavio Eripi — Wed, 01 Aug 2007 06:58:44 -0400

Is there any command to put the values outside the diagonal of a matrix?
For example if I want this matrix:
a= [1,5,5,5;
5,1,5,5;
5,5,1,5;
5,5,5,1];
Thank you

Re: Fill a matrix

us — Wed, 01 Aug 2007 07:36:38 -0400

Flavio Eripi:
<SNIP stitching numbers...

one of the many(!) solutions

     m=ones(4);
     m(~eye(size(m)))=5;
     m

us

Re: Fill a matrix

roberson@ibd.nrc-cnrc.gc.ca (Walter Roberson) — Wed, 01 Aug 2007 07:47:56 -0400

In article <f8pav4$pv1$1@fred.mathworks.com>,
Flavio Eripi <didad30@libero.it> wrote:
>Is there any command to put the values outside the diagonal of a matrix?
>For example if I want this matrix:
>a= [1,5,5,5;
>5,1,5,5;
>5,5,1,5;
>5,5,5,1];
>Thank you

V = 5;
a = magic(4);

cols = size(a,1);
a(~eye(cols)) = V;
--
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