Converting nested for loops to vectors

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Daniel 2016-1-19

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https://ww2.mathworks.cn/matlabcentral/answers/264379-converting-nested-for-loops-to-vectors

编辑： Stephen23 2016-1-19

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All,

I'm trying to convert the following code from nested for loops in order to improve efficiency.

c = 1;
output = zeros(n*m*z,1)
  for i =1:n
     for j = 1:m
        for k = 1:z 
          output(c,:) = function(i, j, k);
          c = c + 1;
        end
     end
  end

is this something that can be vectorized or do I have to try to use the parallel computing toolbox and make use of the parfor looping?

thanks,

dan

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Stephen23 2016-1-19

编辑：Stephen23 2016-1-19

Vectorization does not mean replacing my slow loops with some other code, it means writing functions that operate on entire arrays at once.

This means it is the function that is important, not the loops. However you do not tell us anything about the function, yet it is the only important thing to consider. If you give us details about the function then we can give advice about vectorization.

In general vectorization is more efficient than jumping into using parallel computing.

Daniel 2016-1-19