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matlabmatrixnanrelate

MATLAB: How can I cancel ("NaN" value) elements of a matrix based on another matrix's "NaN" values?

Let's suppose I have a matrix A= 

 1     2     3;
 4     5     6;
 7     8     9

and a matrix B=

1      NaN    3; 
NaN    5      6;  
7      NaN    NaN

I want to cancel the same elements that are canceled in matrix B. It would be:

A2=

 1     NaN     3;
 NaN     5     6;
 7     NaN     NaN

How can I do that?

Solution

  • You could create the new matrix A2 such that each element is a2 = b - b + a.

    This relies on the fact that NaN propagates through the expression evaluation, and b - b is essentially a no-op in all other instances.

    It is also guaranteed never to overflow your type.