Using MATLAB 2012a on a Intel Core i7-3615QM:
Using linear equation solver (backslash operator): 0.26977 seconds
Using invert-and-multiply: 2.4433 seconds
Code:
N = dlmread('N.dat');
d = dlmread('d.dat');
numIters = 100;
tic;
for i=1:numIters
r = N \ d;
end
disp(['Linear solver ' num2str(toc/numIters)]);
numIters = 10;
tic;
for i=1:numIters
r = inv(N) * d;
end
disp(['Invert and multiply ' num2str(toc/numIters)]);
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FRC 1708, 2009-2012, College mentor; 2013-2014, Mentor
FRC 766, 2015-, Mentor