Creating a Parfor loop for multiple function evaluation
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H R
il 29 Mag 2017
Risposto: Walter Roberson
il 29 Mag 2017
Hello. I want to use parfor to reduce the calculation time for a loop I have by evaluating 6 functions at the same time. Could you please help me out with this:
The general form of the loop in my m file is:
x=rand(100,20);
global fidr_m;
fidr_m= fopen('C:/results.txt','w'); %%???
for i=1:100
Y(i)=func(x(i,:))
end
and my function (func) includes some lines to generate a unique text file from a base file depending on the looping variable (i=1:100) and run a very costly function WW.
function y = func(X)
if isempty(count)
count = 1;
else
count = count +1;
end
BasePath='C:/MyComputer/';
BaseName='Comp';
File = strcat(Basename, BaseName, num2str(count),'.txt');
y=WW(File,X);
XX=[X,y];
global fidr_m;
if fidr_m==-1
error('can not open the file');
end
fprintf(fidr_m, '%f\t', XX);
fprintf(fidr_m,'\n');
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Walter Roberson
il 29 Mag 2017
You do not define count in the function before you use it.
global variables are not copied between workers.
You cannot use a worker to do i/o on a file that you open in a different worker.
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