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Speeding up nested for-loop

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Niles Martinsen
Niles Martinsen on 24 Aug 2015
Commented: Star Strider on 24 Aug 2015
Hi
I have the following nested for-loop, containing some if-statements. It is running horribly slow, so I would be very happy to get some hints and tricks to speed it up. Can I vectorize it somehow? Or use parallel computing?
for xi= 1:N
for yi= 1:N
a = A(:,xi,yi); %a is a vector
b = B(:,xi,yi); %b is a vector
D = a-b;
if( max(D./a)<1e-3 )
test_var=2.0;
else
F_min = F(a, b, 0); %F is a script I wrote
F_max = F(a, b, 1); %F is a script I wrote
if( F_min*F_max>0.0 )
test_var=2.0;
else
test_var = F(a, b, 2);
end
end
var(1, xi,yi) = test_var;
end
end
  1 Comment
Star Strider
Star Strider on 24 Aug 2015
It might help if you describe what you want to do in your code, the sizes of ‘A’ and ‘B’ (although they are likely equal), and listed ‘F’ and describe what it does.

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