how can i make loop run faster?

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Ekin Ceyda Cetin
Ekin Ceyda Cetin on 7 Jan 2017
Edited: Jan on 9 Jan 2017
I am trying to make a for-loop run faster.
I used matrices for part of my code instead of loops,
but I can't seem to do it for the loop in the last part of the code below.
Because in the .^ part I get the error that says matrix dimension doesn't match.
Any ideas that can help?
% code
sym sigm
pd6=makedist('exponential','mu',1)
rand1=random(pd6,[2000,100000])
X.r=size(data);
d2 = zeros(X.r(1),10^5);
d3 = zeros(X.r(1),10^5);
mc1=linspace(1,X.r(1),X.r(1));
mc2=linspace(1,10^5,10^5);
mc3=linspace(1,1000,1000);
d2(mc1(1:X.r(1)),mc2(1:10^5))=(rand1(mc1(1:X.r(1)),mc2(1:10^5)));
sig1=-1./(0.2+0.0001*mc3(1:1000));
sig2=((0.2+0.0001*mc3(1:1000))-1)./(0.2+0.0001*mc3(1:1000));
dd2 = zeros(1000,10^5);
dd3 = zeros(1000,10^5);
disp(1);
for mc4=1:1000
dd2(mc4,1:10^5)=sum((d2.^sig1(mc4)),1);
dd3(mc4,1:10^5)=sum((d2.^sig2(mc4)),1);
end
  1 Comment
Jan
Jan on 9 Jan 2017
Edited: Jan on 9 Jan 2017
Replace the expensive power operator 10^5 by a cheap constant 1e5.

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Answers (1)

Jordan Ross
Jordan Ross on 9 Jan 2017
Hello Ekin,
As I understand you are trying to eliminate your for-loop so that your code will run faster but are unable to vectorize due to a dimension mismatch. After looking at your code, it seems that sig1 and sig2 are defined as row vectors instead of column vectors. This is causing the dimension mismatch when trying to vectorize. You can take the transpose of sig1 and sig2 as follows:
sig1 = sig1';
sig2 = sig2';

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