How to access certain matrix elements and turn into NaN?

Hi,

I have two matrices z and interior as shown below:

z =[    9.0000   17.6400   29.1600   43.5600   60.8400   81.0000;
        6.7493   13.2287   21.8679   32.6668   45.6255   60.7440;
        1.1230    2.2011    3.6386    5.4354    7.5916   10.1071;
       -5.0650   -9.9274  -16.4105  -24.5145  -34.2393  -45.5848;
       -8.7197  -17.0907  -28.2520  -42.2035  -58.9454  -78.4777;
       -8.0134  -15.7062  -25.9633  -38.7846  -54.1703  -72.1202]

interior =[     0     0     0     0     0     0;
                0     0     0     0     0     0;
                0     0     1     1     0     0;
                0     0     1     1     0     0;
                0     0     0     0     0     0;
                0     0     0     0     0     0]

I am trying to extract the subscript indices of elements that are 1 in a matrix called interior and then turn the elements with same subscript indices (i.e [3.6386 5.4354; -16.4105 -24.5145]) into NaN in a matrix called z.

So far I have tried to extract the subscript indices as below:

[row,col] = find(interior)
combine = [row, col]

And I tried to use for loop to access the elements with same subscript indices in a matrix z, but couldn't work my way out. Could I get some help on this please? Sorry if it is a too simple question.

Answer 1

[cbrysch]

z(find(interior))=NaN;

should work. It is better to vectorize your data than using a loop.

[RG]

Excellent!! That did the trick. Thanks a lot.