Matrix multiplication
Jan 30, 2007: there is a new
Matlab version which was installed Jan 11
2007. When I constructed the lab I used an older version (and I cannot
use the lastest version on the teacher's side of the system). The new
version is slower on these examples and does not give such a striking
difference. It is more amusing to use
an older version (such as Matlab 7.1).
Start, e.g. by typing /chalmers/sw/sup/matlab-7.1/bin/matlab
Run and explain the following:
A = randn(1000);
tic
for k = 1:10
C = A' * A;
end
toc
tic
for k = 1:10
C = A * A';
end
toc
tic
for k = 1:10
C = A * A;
end
toc
