Hi Luis,
just use:
apply( mat, 2, function(x) length(x[!is.na(x)]) )
I hope it helps.
Best, Dimitris
---- Dimitris Rizopoulos Ph.D. Student Biostatistical Centre School of Public Health Catholic University of Leuven
Address: Kapucijnenvoer 35, Leuven, Belgium Tel: +32/16/396887 Fax: +32/16/337015 Web: http://www.med.kuleuven.ac.be/biostat/ http://www.student.kuleuven.ac.be/~m0390867/dimitris.htm
----- Original Message ----- From: "Luis Rideau Cruz" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, October 15, 2004 1:01 PM
Subject: [R] 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
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