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Add Dirichlet BC to dilation. Stable with variable coeff and conv study yields p+1/2 which probably is ok.
author Martin Almquist <malmquist@stanford.edu>
date Thu, 18 Jan 2018 13:36:56 -0800
parents 8e0067aef5b0
children e76321b89c1e
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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