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28200
2004 Oct 15
6
length with missing values
R-help
I have a martix with missing values( in which I want the sample size by
column)
When I :
apply(matrix,2,length)
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