nested for loop

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Trader
Trader 2012-4-16
I was wondering if there was a way to write nested loops so they are more efficient. For example:
for a = 1:1:100
for b = .5:.1:3
x = bestfitfun(a,b);
end
end
the bestfitfun is a function that runs if statements and really isn't a bottleneck. Any suggestions would be greatly appreciated.
Thank you!
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per isakson
per isakson 2012-4-16
in the signature of bestfit are a and b assumed to be scalars?

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回答（1 个）

Pavel Gorodetsky
Pavel Gorodetsky 2012-6-15
if nesting is an issue, you can use one loop only:
a = 1:1:1000;
b = .5:.1:3;
N = length(a)*length(b);
[A,B] = meshgrid(a,b);
for ii = 1:N
x = bestfitfun(A(ii),B(ii));
end
of course, as per isakson implies, if your bestfitfun could take vectors as an input, and work in some vectorized form, you could loose the two loops altogether:
a = 1:1:1000;
b = .5:.1:3;
x = bestfitfun(a,b);

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