Show or save values in parfor loops in MATLAB

Question

If we use Parfor in MATLAB (parallel computing) we can't save values or workspace using Save('My_workspace'). Besides that if we simply remove ; in every line in For loops MATLAB show the output in command window but in Parfor nothing will appear. Everything in For loop is normal but when I change For to Parfor I will get some errors so I need check stream of data and processes in Parfor.

I want check steam of processes and data as I can see in For loop. How can I do these in Parfor structure?

Thanks.

Answer 1

save is not allowed in parfor. According to this article, the transparency is violated. However you can get around this with a function, as a function has its own stack, as shown in this post

parfor ii = 1:4
    x = rand(10,10);
    y = ones(1,3);
    parsave(sprintf('output%d.mat', ii), x, y);
end

function parsave(fname, x,y)
save(fname, 'x', 'y')
end

The answer to another issue with command window output is "you just can't". See Mathworks' documentation (in the last section, Displaying Output), and the answer is "no".