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view +sbp/diagInd.m @ 1065:c2bd7f15da48 feature/laplace_curvilinear_test

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Add scheme where only corner points are multiplied by dim. Does not seem to decrease spectral radius much, but is stable.
author Martin Almquist <malmquist@stanford.edu>
date Thu, 17 Jan 2019 18:57:54 -0800
parents 32b39dc44474
children
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function A = diagInd(d,n,m)
    A = zeros(n,length(d));
    for i = 1:length(d)
        i0 = 1;
        j0 = d(i)+1;

        I = i0 + (0:(n-1))';
        J = j0 + (0:(n-1))';

        A(:,i) = matInd2VecInd(I,J,n);

    end
end

function I = matInd2VecInd(i,j,n)
    I = i + (j-1)*n;
end