[R] length with missing values

Luis Rideau Cruz Luisr at frs.fo
Fri Oct 15 13:01:25 CEST 2004


I have a martix with missing values( in which I want the sample size by
When I :


I get the length of the vector regardless of missing values.
I can't pass an argument to length in apply.

Alternatively I could 

ifelse ( is.na ( matrix [, "columns in matrix " ] ) , 0 , 1)

Is there any easier way?

Thank you

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