Modifying matrix with if statement

   Hello, Im trying to modify a matrix with if statements, not sure if Im approaching it the correct way. Here's the problem, I have a variable nn=6 in this case, and two matrices of size (nn,2). 
    first matrix is called indi: 

0  0
1  2
3  4
5  0
6  7
8  9

second matrix is made in the first for loop shown and gives the following result:

-5  10.416
0  0
0  0
0  14.583
0  0
0  0

What Im trying to achieve is to get the second for loop to remove the rows of the second matrix in which both values are zeros. So what i need is just basically:

-5  10.416
0  14.583

The error I get is "index exceeds matrix dimensions" which is probably happening since the second for loop goes from 1 to nn, and as it cycles the matrix stops being of size (nn,2). Anyone have any ideas on how to get around this??

here's the code:

   for ii=1:nn
             if indi(ii,1)==0
              reacc(ii,1)=nodos(ii,1);
             else
              reacc(ii,1)=0;
             end
             if indi(ii,2)==0
              reacc(ii,2)=nodos(ii,2);
             else
              reacc(ii,2)=0;
             end
    end

   for jj=1:nn
       if (reacciones(jj,1)==0) & (reacciones(jj,2)==0)
           reacciones(jj, :) = []
       end
   end

Answer 1

[Roger Stafford]

To correct the problem you describe, do that last for-loop backwards:

    for jj=nn:-1:1
       if ....

[Alejandro]

I appreciate the help!! Thank you