MATLAB: How to avoid or delete Nan values in addtion

Question

if i have2 matrix

A=[2 NaN ; 3 NaN]  
B=[NaN 4 ; NaN 5]

I want C as

[2  4 ; 3 5 ]

edited by guillaume: Nan is not valid in matlab. NaN or nan is.

Answer 1

A=[2 NaN ; 3 NaN]  %Edited
B=[NaN 4 ; NaN 5]
A(isnan(A))=0
B(isnan(B))=0
C=[A;B]'