Copying index positions to other matrices

Hi, I am trying to equate the index postion of a matrix onto other matrices. This what I did and the results do not seem to be correct

A = rand(10,10);                 % First Random Matrix
A2 = rand(10,10);                % Second Random  Matrix

M = mean2(A);                    %Mean Value of A
B = A;                           %Copy 
B(B<M) = NaN;
[row, col] = find(isnan(B));     %NaN Index Position of B


B2 = A2; 
B2([row, col])=NaN              %Copy of NaN Index Position onto array B2

Now unfortuntely it does not seem to transfer the index position of B onto array B2.

Thanks

Answer 1

[madhan ravi]

B2(sub2ind(size(B),row,column))=NaN

Why not directly use logical indexing from isnan() ?

[Zaharaddeen Hussaini]

Thanks Thats preceisly it.

Don't quite understand the second bit. You mean ditch the find() statement?

[madhan ravi]

Yes

[Zaharaddeen Hussaini]

Ahh did not know isnan does logical indexing as well. Thanks alot. Will apply the techniques

[Jan]

This means:

mask = (B < M);
B(mask) = NaN;
B2 = A2; 
B2(isnan(B)) = NaN; 

[madhan ravi]

@Jan: Bedank' mich :)