Mercurial > repos > public > sbplib

view +sbp/diagInd.m @ 1289:2fd2e2337b77 feature/boundary_optimized_grids

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Add utility function for constructing a (possibly multidimensional) grid based on the grid points used by the boundary optimized SBP operators
author Vidar Stiernström <vidar.stiernstrom@it.uu.se>
date Wed, 01 Jul 2020 15:15:30 +0200
parents 32b39dc44474
children
line wrap: on
line source

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