Automatically Assigning base workspace variables

Question

Abhijit 2013-9-24

0
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https://ww2.mathworks.cn/matlabcentral/answers/88018-automatically-assigning-base-workspace-variables

编辑： David Arriola 2014-10-9

I have almost 250 variables that I need to assign in the base workspace inside a PARFOR loop. Is there an automated way of doing this other than writing assignin('base','var',var) for each variables?

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Abhijit 2013-9-24

Well, I am trying to do parallel simulation and one of the matlab webinars say that variables have to be assigned for each simulink model's variable into the base workspace for parallel simulation.

As Walter had mentioned variables had to be defined via assignin in order to make them available.

Image Analyst 2013-9-24

OK - I don't have Simulink. I added it to the product list for you so others will know.

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Answer 1

Walter Roberson 2013-9-24

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Avoid doing that. For example create only a single struct and assignin() the struct.

http://matlab.wikia.com/wiki/FAQ#How_can_I_create_variables_A1.2C_A2.2C....2CA10_in_a_loop.3F

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Abhijit 2013-9-24

Hi Walter, Thanks for your answer. Structure would work for the simple exam I showed.

In my actual problem, the variables are getting generated behind the scenes. So, are there any other way for doing this? Can I leverage WHO in some way to do this.

Abhijit 2013-9-25

在 MATLAB Online 中打开

I think I have figured out a way.

a = -1; 
b = 1; 
c = 1; 
d = 0;
W = who; 
for i1 = 1:length(W)
    Wval{i1} = eval(W{i1});
end
KIdx = 0:0.1:1;
iterations          = length(KIdx);
simout(iterations)  = Simulink.SimulationOutput;
parfor idx = 1:iterations
      load_system(mdl); 
      for i1 = 1:length(W)
          assignin('base',W{i1},Wval{i1});
      end
      assignin('base','K',KIdx(idx));
      try
          simout(idx) = sim(mdl,'SimulationMode','normal'); 
      catch exception
          error_var{idx} = lasterror
          stack_var{idx} = dbstack
          exception_var{idx} = getReport(exception,'extended')
      end
end

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Answer 2

David Arriola 2014-10-9

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/88018-automatically-assigning-base-workspace-variables#answer_154554

编辑：David Arriola 2014-10-9

在 MATLAB Online 中打开

I have a similar problem to the one described above. I tried the solution proposed by Abhijit but I always get the following error: - Can somebody help me to get this right?

"It is illegal to use a Composite within the body of a parfor loop

Caused by: Error using distcomp.remoteparfor (line 72) Composite objects cannot be used within a parfor loop."

My code can be seen below:

 list = who;       
    N = length(list);
    for  j = 1:N
      w{j} = eval(list{j});
    end
    spmd
    % Setup tempdir and cd into it
    addpath(pwd);
    currDir = pwd;
    addpath(currDir);
    tmpDir = tempname;
    mkdir(tmpDir);
    cd(tmpDir);
    end
    %Set parameter values with reduced comb. matrix and simulate all combs.
    parfor m = 1:1:num_comb_red      
            load_system(uParam.sysInfo.modelName); % Load the model parameters on the workers       
            for  j = 1:N
                assignin('base',list{j}, w{j});
            end
        for n = 1:1:num_input_param
            num_value_red = cell2mat(comb_red(n,m));
            path = cell2mat(uParam.uncertainties.all{n,1});
            para_name = uParam.uncertainties.all{n,2};
            para_value = uParam.uncertainties.all{n,3}(num_value_red);
            set_param(path,para_name,num2str(para_value));
        end                        
        %Simulate model for all uncertainty combinations and all temperatures
        disp('Simulating linear model...')
        simOut(i,m) = sim(uParam.sysInfo.modelName,'SimulationMode', uParam.simInfo.simMode, 'StopTime', uParam.simInfo.simTime);
        disp('finished')  
    end