Mercurial > repos > public > sbplib

view +sbp/diagInd.m @ 1217:a3d9567d9004 feature/d2_compatible

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Improve efficiency of construction of D2(b) by precomputing as much as possible
author Martin Almquist <malmquist@stanford.edu>
date Wed, 13 Nov 2019 14:54:22 -0800
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