Remove the NaN elements in a matrix
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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
采纳的回答
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),:) = [] ;
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