Array of structures with parfor in Matlab

Question

I am using Matlab to work on my project, and I want to use "parfor" as a part of my code that returns an array of structures in each its iteration, But when I run my code I got some errors. I just tried to bring an example of my problem in the simplest way. Will be appreciated any helps! Here is the example:

clear;
clc;
% An arbitrary number 
constant_Number=3;
tic
parfor i=1:2
    k=[constant_Number,i];
    r(i)=test(k);
end
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and test function is as follows:

function [a]=test(k)
   a.first=k(1) * k(2);
   a.second=k(1)+k(2);
   b.first=k(1)/k(2);
   b.second=k(1);
   a=[a;b];
end

One note is that when I just return one structure, it works fine but when I have more than one (adding b for instance), I got the following error: "Unable to perform assignment because the indices on the left side are not compatible with the size of the right side."

Thanks, Ali

Answer 1

Find the solution, just need to define a cell array and then finally merge them! Follow can be an answer:

clear;
clc;
% An arbitrary number 
constant_Number=3;
% Define an arbitrary array of structure 
arb_arr=[];
% Define an arbitrary cell array
r={};
tic
parfor i=1:2
    k=[constant_Number,i];
    r{i}=test(k);
end



for i=1:2
   arb_arr=[arb_arr;r{i}];
end


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