MATLAB: Replace corresponding elements in two different matrices

arrayelementMATLABreplace

I have two matrices A and B. The matrix A contains missing data (shown as -9999) which I have replaced with NaN. Matrix B has no missing data. I want to replace the corresponding elements in B with NaN as well so the NaNs for both matrices are located in the same cells. How can I do that?

Best Answer

Try this: 
A = [1 2 3 4; 5 NaN 7 8; 9 10 11 NaN]
B = randi(9, 3, 4)
NewB = B
NewB(isnan(A)) = NaN
producing: 
A =
     1     2     3     4
     5   NaN     7     8
     9    10    11   NaN
B =
     2     7     6     8
     5     8     3     4
     7     7     4     1
NewB =
     2     7     6     8
     5     8     3     4
     7     7     4     1
NewB =
     2     7     6     8
     5   NaN     3     4
     7     7     4   NaN
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