For loop
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hi 2 all, Can anyone say how to reduce execution time of 'for loop' in matlab How to replace for loop?
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Andrei Bobrov
le 16 Août 2011
u1 = 255*sign(ima);
but you get the array size is 1600 x 1600, with values of -255, 0 and 255
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if i1 and j1 integers from 1 to 1600, we obtain an array of 1600 by 1600, consisting of ones, in it case use
i1 = linspace(0,1,6);
j1 = i1;
T=cos(2*pi*repmat(i1',1,numel(j1))).*cos(2*pi*repmat(j1,numel(i1),1)); % 1 variant
T = bsxfun(@times,cos(2*pi*i1'),cos(2*pi*j1)); % 2 variant
T = cos(2*pi*i1')*cos(2*pi*j1);% 3 variant
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Walter Roberson
le 16 Août 2011
The one sure way to reduce the execution time of a for loop is to eliminate that section of code.
Anything else depends on exactly what your for loop contains. There are some for loops that are now faster than vectorizing or using one of the library routines -- faster even than using a mex routine.
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