Mercurial > repos > public > sbplib
view diags.m @ 549:ae905a11e32c feature/grids
Change away from matrix formulation in Rk4 second order form
The new formulation can be up to 8 times faster
author | Jonatan Werpers <jonatan@werpers.com> |
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date | Mon, 28 Aug 2017 11:06:00 +0200 |
parents | 0b87863cb29c |
children |
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function A = diags(B,d,m,n) assert(size(B,1) == m); A = repmat(B(:,1)*0, [1, n]); for i = 1:size(B,2) A(:,d(i)+ (1:m)) = A(:,d(i)+ (1:m)) + diag(B(:,i)); end end