I have a problem where a vector within a struct is much slower to
index than a plain vector (~8x slower) .
x = zeros(1e6,1);
s.x = x;
subset = 500e3:600e3-1;
y = randn(length(subset),1);
for i = 1:5
tic; x(subset) = y; toc;
end
for i = 1:5
tic; s.x(subset) = y; toc;
end
tic;
for i = 1:100
x(subset) = y;
end
toc;
tic;
for i = 1:100
s.x(subset) = y;
end
toc;
Tested using Octave 3.0.3 on x86-64.
--
Thanks,
Jonathan Kotta
Hofstadter's Law:
It always takes longer than you expect, even
when you take into account Hofstadter's Law.
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