Mercurial > repos > public > sbplib

annotate +blockmatrix/multiply.m @ 1031:2ef20d00b386 feature/advectionRV

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
For easier comparison, return both the first order and residual viscosity when evaluating the residual. Add the first order and residual viscosity to the state of the RungekuttaRV time steppers
author Vidar Stiernström <vidar.stiernstrom@it.uu.se>
date Thu, 17 Jan 2019 10:25:06 +0100
parents 288138d9586d
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
388
288138d9586d Add function to multiply blockmatrices.
Jonatan Werpers <jonatan@werpers.com>
parents:
diff changeset
1 function C = multiply(A, B)
288138d9586d Add function to multiply blockmatrices.
Jonatan Werpers <jonatan@werpers.com>
parents:
diff changeset
2 [n_a, m_a] = size(A);
288138d9586d Add function to multiply blockmatrices.
Jonatan Werpers <jonatan@werpers.com>
parents:
diff changeset
3 [n_b, m_b] = size(B);
288138d9586d Add function to multiply blockmatrices.
Jonatan Werpers <jonatan@werpers.com>
parents:
diff changeset
4
288138d9586d Add function to multiply blockmatrices.
Jonatan Werpers <jonatan@werpers.com>
parents:
diff changeset
5 assert(m_a == n_b, 'Dimensions do not agree.')
288138d9586d Add function to multiply blockmatrices.
Jonatan Werpers <jonatan@werpers.com>
parents:
diff changeset
6
288138d9586d Add function to multiply blockmatrices.
Jonatan Werpers <jonatan@werpers.com>
parents:
diff changeset
7 C = cell(n_a, m_b);
288138d9586d Add function to multiply blockmatrices.
Jonatan Werpers <jonatan@werpers.com>
parents:
diff changeset
8
288138d9586d Add function to multiply blockmatrices.
Jonatan Werpers <jonatan@werpers.com>
parents:
diff changeset
9 for i = 1:n_a
288138d9586d Add function to multiply blockmatrices.
Jonatan Werpers <jonatan@werpers.com>
parents:
diff changeset
10 for j = 1:m_b
288138d9586d Add function to multiply blockmatrices.
Jonatan Werpers <jonatan@werpers.com>
parents:
diff changeset
11 C{i,j} = sparse(size(A{i,1},1), size(B{1,j},2));
288138d9586d Add function to multiply blockmatrices.
Jonatan Werpers <jonatan@werpers.com>
parents:
diff changeset
12 for k = 1:n_b
288138d9586d Add function to multiply blockmatrices.
Jonatan Werpers <jonatan@werpers.com>
parents:
diff changeset
13 C{i,j} = C{i,j} + A{i,k}*B{k,j};
288138d9586d Add function to multiply blockmatrices.
Jonatan Werpers <jonatan@werpers.com>
parents:
diff changeset
14 end
288138d9586d Add function to multiply blockmatrices.
Jonatan Werpers <jonatan@werpers.com>
parents:
diff changeset
15 end
288138d9586d Add function to multiply blockmatrices.
Jonatan Werpers <jonatan@werpers.com>
parents:
diff changeset
16 end
288138d9586d Add function to multiply blockmatrices.
Jonatan Werpers <jonatan@werpers.com>
parents:
diff changeset
17 end