Remove the NaN elements in a matrix

Hi everybody, I have a problem with removing the NaN elements in a matrix, Suppose we have a matrix A of size M, N and there are some NaN elements. So I want to remove all the rows that contain NaN elements.

I wrote some commands but they do not work. Could you please check it for me?

[m n]=size(A);
for i2=m:-1:1
    for i3= 1:n
        if (isnan(A))
            A(i2,:)=[];
        end
    end
end

Answer 1

[Cedric]

 A(any(isnan(A),2),:) = [] ;

To understand, evaluate

 isnan( A )
 any( isnan( A ), 2 )
 class( any( isnan( A ), 2 ))

and you will see that the latter is a vector of logicals which flags rows that contain one or more NaN elements. We use it for indexing rows of A (logical indexing), and we set indexed rows to empty.

PS: this will work on A in one shot (so no need to iterate through rows backward. If you need to keep A unaltered, you can operate on a copy

 powernew = A ;
 powernew(any(isnan(powernew),2),:) = [] ;

[Son C. Chu]

thank you so much