Variable not recognized outside a loop

Question

Saad 2014-7-28

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回答： Saad 2014-7-28

Dear All,

I have a simple but a long code. As you can see from the loop below, I am not a very efficient coder but my code works. However, the program does not recognize the matrix F inside the loop. How can I make the code recognize the F matrix which I need to use once the loop is finished. Thank you very much

Kind Regards

S

v=1;
for z=1:length(rc)
  for j=1:length(r)
      for i=1:length(n)
          for k=1:length(d)
              for l=1:length(s)
                  F(v,:)=[z, l, x];
              end
          end
      end
  end
end

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Ben11 2014-7-28

What do you mean by "does not recognize"? Can you show the error message you get?

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Answer 1

Azzi Abdelmalek 2014-7-28

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https://ww2.mathworks.cn/matlabcentral/answers/143616-variable-not-recognized-outside-a-loop#answer_146658

编辑：Azzi Abdelmalek 2014-7-28

在 MATLAB Online 中打开

Why do you think F is not recognized? Type

F

you will see the result

You have maybe forgotten the incrementation of v

v=1;
for z=1:length(rc)
  for j=1:length(r)
    for i=1:length(n)
        for k=1:length(d)
            for l=1:length(s)
                F(v,:)=[z, l, x];
                v=v+1;
            end
        end
    end
  end
end

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Answer 2

dpb 2014-7-28

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在 MATLAB Online 中打开

v=1;
for z=1:length(rc)
  for j=1:length(r)
    for i=1:length(n)
      for k=1:length(d)
        for l=1:length(s) 
          F(v,:)=[z, l, x];
          ...

Set

F=zeros(maxV,length([z l x].'));

first. NB that your orientation of the vector must be column, not row or this will fail. z and x needs must be defined somewhere else, too, of course.

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Answer 3

Saad 2014-7-28

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https://ww2.mathworks.cn/matlabcentral/answers/143616-variable-not-recognized-outside-a-loop#answer_146661

It says " ??? Undefined function or variable 'F'."

Thanks to the output "F" I managed to build another code below the loop. Now for some reasons, F can not be used outside the loop because it is not recognized- I must have missed something. Any advice is much appreciated. Thank you

S