Subscript indices must either be real positive integers or logicals.

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alireza kooshafar 2018-10-25

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评论： alireza kooshafar 2018-10-25

采纳的回答： jonas

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i got this error in this code i don't know why.

c=[x(1:end-1,:),x(2:end,:)];
      dx=c(:,2)-c(:,1);
      t=[y(1:end-1,:),y(2:end,:)];
      dy=t(:,2)-t(:,1);
      ra=[];
      rb=[];
     for i=1:size(dx)
         if   dx(2i-1)>0 & dy(2i)<0;
             ra(2i-1)=1;
             ra(2i)=1;
         end
           if dy(2i-1)>0 & dx(2i)<0;
             rb(2i-1)=1;
             rb(2i)=1;
           end
     end

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Adam 2018-10-25

Which line is the error on? You can use the stop/pause on errors debug option from the Breakpoints menu to have the code stop at the line causing the error. Then it is trivial to work out what is wrong by looking at any subscript indices you are using in the command window.

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jonas 2018-10-25

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编辑：jonas 2018-10-25

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It's hard to tell without having some input, but these types of lines are definitely wrong:

ra(2i)=1;

i is being interpreted as imaginary, which is why you should not use i as a looping variable.

ans =

0.0000 + 2.0000i

Could be other errors as well.

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alireza kooshafar 2018-10-25

I have two matrices(dx dy), I'm looking for a condition to check 1. If the first array of dx was a positive (negative), the first array of dy be a negative (positive) array. 2. If the event is the first one, check if the odd arrays of dx and dy will all be the same and the even arrays are exactly the opposite.

alireza kooshafar 2018-10-25