An "if-loop" and "for-loop" problem

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Angus Wong 2018-6-20

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评论： Angus Wong 2018-6-20

Please help. I am trying to make a nested for-loop with a if-loop inside as follows:

 S=0;
 for i=1:10
     for j=(i+1):10
         for k=(j+1):10
             for l=(k):10
                 if i<j && j<k && k<l && range(l)~=0 && range(k)~=0 && range(j)~=0 && range(i)~=0
                     S=S+i*j*k*l;
                 end
             end
         end
     end
 end

This code doesn't work. Any way to solve this?

The purpose of the range function I used is that if the upper limit and the lower limit of the counter are the same, then S remains unchanged.

The result I want is something like S=1x2x3x4+1x2x3x5+1x2x3x6+.....+7x8x9x10

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Answer 1

the cyclist 2018-6-20

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I haven't tried to run your code, but I'm going to guess here that the expressions like

range(i)

are not doing what you expect. i is just a scalar, so range(i) is always going to be equal to zero. The range command returns the difference between the maximum and the minimum value of the input.

I'm not quite sure what you intended there.