Retrive variable out of a parfor loop

I've got a simple problem, I run a parfor loop inside which i call a function which return some variables, the problem is that some of this variables does not show in the workspace.

Answer 1

[Thiago Henrique Gomes Lobato]

You have an error in your mont_carlo inputs, it should be

[x,neigh,E,M]= monte_carlo ( N, T, iter,init )

or you should delete the line

x = init ; 

Besides this what exactly is the problem you're having? E and M should be showing in the workspace, since you gave it index to them. x and neigh are replaced in every loop in a random order, so no consistent result can be expected from them.

[andrea]

Yes sorry for the error x = init, iI have noticed it.

But thank for the answer the problem was x and neigh.

Because I should find a way to imagesc(x) at the end of each iteration, i.e every time i run monte_carlo.m i would like to have x to plot it.

Do you think it is possible ?=

[Thiago Henrique Gomes Lobato]

Sure. You can either plot in the loop as:

parfor...
        
figure,imagesc(x),title(['T: ',num2str(T_span(i))])

end

or save the x and neigh variables in a cell, so you can retrieve all of them after the parfor loop:

[x{i},neigh{i},E(i),M(i)] = monte_carlo(N,T_span(i),iter,init) ; 

[andrea]

It works fine, could you briefly explain me why does it work with cell ?

[Thiago Henrique Gomes Lobato]

When you have only one single value, those can be saved in a vector for each iteration, as the case with E and M. If you have a matrix, vector or anything different than a single number, it is not possible to attribute it's value to a single vector entry, so you have to use data structures that can handle it. Cell is just one of them, where you can save basically anything and then retrieve it with only the index.