How can i use the output of function after parfor loop?

The following is my code

parfor ii =1:10
    for jj = 1:length(DynamicAnalysis.Name)
        chk=1;
        GroupName=char(GlobalGroupDescrption(ii));
        fprintf('Working on Extracting Frame Component Forces for %s Analysis %s\n',GroupName,DynamicAnalysis.Name{jj});
        FrameComponentResults=GetFrameComponentResults(DynamicAnalysis.Name{jj},DynamicAnalysis.Number(jj),DynamicAnalysis.TimeStep(jj),DIR{jj},ii,GroupData,PerformGroup,GroupComponentType,EleComponentType,EleComponentRepeat,SortedEleCompType,SortedEleCompRepeat);
        %%%%%
    end
end
        

As outlined, GetFrameComponentResults is a function. The output of the function is FrameComponentResults, which is a struct array. How can I prevent the FrameComponentResults from being considered as a temporary variable so that I store its content following each "jj" for-loop iteration.

Answer 1

[Walter Roberson]

parfor ii =1:10
    for jj = 1:length(DynamicAnalysis.Name)
        chk=1;
        GroupName=char(GlobalGroupDescrption(ii));
        fprintf('Working on Extracting Frame Component Forces for %s Analysis %s\n',GroupName,DynamicAnalysis.Name{jj});
        FrameComponentResultsj{jj} = GetFrameComponentResults(DynamicAnalysis.Name{jj},DynamicAnalysis.Number(jj),DynamicAnalysis.TimeStep(jj),DIR{jj},ii,GroupData,PerformGroup,GroupComponentType,EleComponentType,EleComponentRepeat,SortedEleCompType,SortedEleCompRepeat);
        %%%%%
    end
    FrameComponentResults(ii,:) = FrameComponentResultsj;
end
        

[Qusay Al Chatti]

Thanks Walter, but the parfor loop dose not accept the use of variable FrameComponentResultsj{jj}

[Walter Roberson]

namelen = length(DynamicAnalysis.Name);
parfor ii =1:10
    FrameComponentResultsj = cell(1,namelen);
    for jj = 1:namelen
        chk=1;
        GroupName=char(GlobalGroupDescrption(ii));
        fprintf('Working on Extracting Frame Component Forces for %s Analysis %s\n',GroupName,DynamicAnalysis.Name{jj});
        FrameComponentResultsj{jj} = GetFrameComponentResults(DynamicAnalysis.Name{jj},DynamicAnalysis.Number(jj),DynamicAnalysis.TimeStep(jj),DIR{jj},ii,GroupData,PerformGroup,GroupComponentType,EleComponentType,EleComponentRepeat,SortedEleCompType,SortedEleCompRepeat);
        %%%%%
    end
    FrameComponentResults(ii,:) = FrameComponentResultsj;
end
        

[Qusay Al Chatti]

Many thanks, it worked except with this minor modification

FrameComponentResults{ii} = FrameComponentResultsj;

Otherwise, it was giveing me error "Conversion to double from cell is not possible."

[Walter Roberson]

You should initialize Frame Components Results as a 2d cell array.

Answer 2

[Edric Ellis]

You need to output the result into some sort of "sliced variable". Basically this means outputting an array where one of the subscripts is the parfor loop variable. For example:

parfor ii = 1:2
    for jj = 1:2
        % Here, 'out' is a sliced output variable.
        out{ii,jj} = struct('result', ii + jj);
    end
end
format compact, celldisp(out)

out{1,1} =
    result: 2
out{2,1} =
    result: 3
out{1,2} =
    result: 3
out{2,2} =
    result: 4

[Qusay Al Chatti]

Thanks for your response. In my case, I can do

out{ii,jj} = struct('result', FrameComponentResults);

where FrameComponentResults is struct array and is the output of my function. But, by doing so, matlab is giving me error as follow

Error: The variable out in a parfor cannot be classified.

I don't get the same error if I try

out{ii,1} = struct('result', FrameComponentResults);

But i can't have jj=1. Is there a way to classify variable out properly?

Thanks

[Edric Ellis]

Hm, you might be tripping over the rule about the bounds of the nested for loop. It might work to do this:

Ni = length(DynamicAnalysis.Name)
parfor ii = 1:10
    for jj = 1:Ni
        out{ii,jj} = ...
    end
end