MATLAB: What is wrong with the For loop

for loops

Hi all
I wrote the code below and it's supposed to be able to multiply the positive values by two and multiply negative values by 3. The code works perfectly for square matrices. For example [-7 10 1 -12;-9 -9 -7 -15;0 -2 8 -2;-15 7 14 -14]. However, it doesn't work for other matrices such as a 3*4. It simply doesn't multiply the last columns by any number. Can anyone please help me?
Thanks
A = input('Enter your matrix: ')
for ii = 1:size(A)
   for jj = 1:size(A)
      if A(ii,jj) > 0
          A(ii,jj) = 2*(A(ii,jj));
      else
          A(ii,jj) = 3*(A(ii,jj))'
      end
   end
end

Best Answer

A = input('Enter your matrix: ')
for ii = 1:size(A,1)
   for jj = 1:size(A,2)
      if A(ii,jj) > 0
          A(ii,jj) = 2*(A(ii,jj));
      else
          A(ii,jj) = 3*(A(ii,jj)) ;
      end
   end
end
You are running loop only along the number of times the row's are. Now I have included columns also.
You can achieve the same without loop.
B =A ;
B(A>0) = 2*A(A>0) ;
B(A<0) = 3*A(A<0) ;
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