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Implementation of D1 based on Gauss quadrature formula with 4 nodes.
author Martin Almquist <martin.almquist@it.uu.se>
date Thu, 02 Feb 2017 17:05:43 +0100
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