How to maintain NaN after calculations in tables?

Sorry this is the first time I have posted a question.

I am trying to create a new column in my table using parameter like (rows = T.Age < 40). This creates a logical array of the same size as the original column, but when I create the new column and use T.new(:,:)=T.height(rows). It won't add the new column because the array is now smaller due to NaNs in my table.

How do i keep the NaN values and have it carry over and create a new column?

Answer 1

[Walter Roberson]

T.new(rows) = T.height(rows);
nanrows = isnan(T.Age);
T.new(nanrows) = nan;

[James Wong]

thank you!