using parallel computing outside a loop

Hi to everyone!

I have to calculate multiple similar inputs with a function that I have written myself and I wondered how i can use parallel computing in this case. I have used parfor in older and other problems already, but i dont know if there are other options to use paralel computing outside loops.

How can I use parallel computing to compute all these simultaneously?

my code is in the comments.

Thanks in advance

[Aref Kalantari]

tic
loop_new1 = ImRegbVal(Data_reg,bVec1(segment),0); %Plot GUI=1 , No plot GUI = 0    %128*128*2*36
toc

tic
loop_new2 = ImRegbVal(Data_parts2,bVec2,0); %Plot GUI=1 , No plot GUI = 0    %128*128*2*36
toc

tic
loop_new3 = ImRegbVal(Data_parts3,bVec3,0); %Plot GUI=1 , No plot GUI = 0    %128*128*2*36
toc

tic
loop_new4 = ImRegbVal(Data_parts4,bVec4,0); %Plot GUI=1 , No plot GUI = 0    %128*128*2*36
toc

tic
loop_new5 = ImRegbVal(Data_parts4,bVec4,0); %Plot GUI=1 , No plot GUI = 0    %128*128*2*36
toc

tic
loop_new6 = ImRegbVal(Data_parts4,bVec4,0); %Plot GUI=1 , No plot GUI = 0    %128*128*2*36
toc

Answer 1

[Raymond Norris]

Hi Aref,

You don't explain how you're already using parfor -- that could negate what else you can do.

Here's a crude example, there's a little cleanup/verifying to do, but it'll get you started in the right direction. Read more about parfeval to see how it can be used.

p = parpool();

dp = {Data_reg,Data_parts2,Data_parts3,Data_parts4,Data_parts4,Data_parts4};
bv = {bVec1(segment),bVec2,bVec3,bVec4,bVec4,bVec4};

% Submit jobs
for idx = 1:length(dp)
    f(idx) = parfeval(@ImRegbVal,dp{idx},bv{idx},0);
end

% Fetch results
for idx = 1:length(dp)
    [idx, val] = f.fetchNext;
    % Do something with loop # 'idx' and loop value 'val'
    %  ...
end

Raymond

[Aref Kalantari]

Thanks Raymond, I have corrected my question. And your answer helped me too with my problem. Thank you.