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view spdiag.m @ 270:d755816aa0fa

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added a u_t+u_x=0 scheme
author Ylva Rydin <ylva.rydin@telia.com>
date Fri, 09 Sep 2016 16:47:53 +0200
parents 9c0192cf099f
children 8e0067aef5b0
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function A = spdiag(a,i)
    default_arg('i',0);
    n = length(a)-abs(i);
    A = spdiags(a,i,n,n);
end