How to skip an input in a loop when an error is raised and continue with the next input of the loop?

Question

Cynthia Dickerson 2018-6-12

0
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https://ww2.mathworks.cn/matlabcentral/answers/405345-how-to-skip-an-input-in-a-loop-when-an-error-is-raised-and-continue-with-the-next-input-of-the-loop

评论： Cynthia Dickerson 2018-6-12

I am trying to evaluate the bias of a particular function. To do this, I have a series of nested loops that change multiple input variables. Normally everything goes fine, but for a couple of combinations of inputs, the main function (qb.m) raises an error (below):

if (abs(2*z0) > abs(za))
  error(' -- Decrease skew sensitivity. --');
end

My function just runs the qb.m function over and over again, records the outputs, and does a little calculation. When it hits an illegal combination, though, the main function ends execution and displays "Decrease skew sensitivity". Is there a way to make Matlab just move on to the next iteration of the loop instead of ending execution?

My code looks basically like this:

if true
  for radfrac= Radfrac_min : Radfrac_step : Radfrac_max 
     for u=1:Max_training
       for v=0:dimension; 
         for j=1:8
         newspec = [compass_points(j,:)];
            for i=1:z
              B=50*i;
              [BTRAIN,CNTER]=replica(TNSPEC,B);
              [sds,sdskew,qrr] =qb(TNSPEC,BTRAIN,newspec,CNTER,radfrac,sensitiv);
              bias=sds-expected_standard_deviation(j);
              SDS_matrix(((j-1)*z+i),:)=[compass_points(j,:),B,sds,bias,sdskew];
            end
          SDS_matrix
          end
           % Run that last block 5 more times, changing only the name
           for j=1:8
           newspec = [compass_points(j,:)];
              for i=1:z
                B=50*i;
                [BTRAIN,CNTER]=replica(TNSPEC,B);
                [sds,sdskew,qrr] =qb(TNSPEC,BTRAIN,newspec,CNTER,radfrac,sensitiv);
                bias=sds-expected_standard_deviation(j);
                SDS_matrix(((j-1)*z+i),:)=[compass_points(j,:),B,sds,bias,sdskew];
              end
            SDS_matrix
            end
            %Average those six runs
            %Do some calculations
            %Store answers in a cell array

end end end end end

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Answer 1

Matt Dickson 2018-6-12

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https://ww2.mathworks.cn/matlabcentral/answers/405345-how-to-skip-an-input-in-a-loop-when-an-error-is-raised-and-continue-with-the-next-input-of-the-loop#answer_324416

在 MATLAB Online 中打开

You should make your loop code inside a try/catch block and catch the error. It would look like

    for i = 1:100 % whatever your loop is
       try
           % Your loop code here
       catch
           % Nothing should happen, just move on
           continue;
       end
    end