decreasing the number of for-loops

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som
som 2012-1-25
I've written a program having some loops. I aim to decrease the number of loops as well as the run-time of program. How can I do this?? a part of this mentioend program is as below:
for t = 1:T
for i = 1:M
for j = 1:M
Pr{t}(i,j) = 1 / sqrt(2*pi*S(1,t)) * exp(-1/(q(i,t)-f(j,t))^2);
end
end
end
Thanks,
  1 个评论
Jan
Jan 2012-1-25
I've formatted the code. Please use the "{} Code" button to apply the correct formatting. Thanks.

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回答（1 个）

Jan
Jan 2012-1-25
for t = 1:T
Pr{t} = 1 / sqrt(2*pi*S(1,t)) * exp(-1 ./ (bsxfun(@minus, q(:,t), f(:,t).').^2);
end
Please test this. I cannot run Matlab currently.
[EDITED] Small typo in the BSXFUN arguments.
  2 个评论
som
som 2012-1-25
Dear Jan, it doesn't work appropriately.
Jan
Jan 2012-1-26
Posting the error message would be fine. Be aware, that I cannot run the code, because you did not provide any values for the variables. But when I cannot run the code, I cannot see the error message, which contains useful imformation to locate and fix the problem.
Anyhow, I've found one typo in the code and fixed it.

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