Creating a Parfor loop for multiple function evaluation

Question

H R 2017-5-29

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/342300-creating-a-parfor-loop-for-multiple-function-evaluation

回答： Walter Roberson 2017-5-29

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');