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view spdiag.m @ 1325:1b0f2415237f feature/D2_boundary_opt

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Add variable coefficient boundary-optimized second derivatives.
author Vidar Stiernström <vidar.stiernstrom@it.uu.se>
date Sun, 13 Feb 2022 19:32:34 +0100
parents e76321b89c1e
children
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function A = spdiag(a,i)
    default_arg('i',0);

    if isrow(a)
        a = a';
    end

    n = length(a)+abs(i);
    A = spdiags(a,i,n,n);
end