Hi Luis, Are you looking for the number of missings in each column? If so, try this:-
> bob<-matrix(c(2:4, NA, 5:7, NA), ncol=2) > colSums(is.na(bob)) [1] 1 1 Hope this helps, Ian. mangosolutions R Consulting and Training Services Tel +44 118 902 6620 Fax +44 118 902 6401 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Luis Rideau Cruz Sent: 15 October 2004 12:01 To: [EMAIL PROTECTED] 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 ______________________________________________ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html [[alternative HTML version deleted]] ______________________________________________ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
