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Cleaning of variable 2nd deriv in 4th order.
author Jonatan Werpers <jonatan@werpers.com>
date Fri, 23 Sep 2016 22:58:45 +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