On Fri, 15 Oct 2004, Luis Rideau Cruz wrote: > 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?
You could omit the missing values before: apply(matrix, 2, function(y) length(na.omit(y))) hth, Z > 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 > ______________________________________________ [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
