On 6/20/05, Weiwei Shi <[EMAIL PROTECTED]> wrote: > hi, > i have another question on tapply: > i have a dataset z like this: > 5540 389100307391 2600 > 5541 389100307391 2600 > 5542 389100307391 2600 > 5543 389100307391 2600 > 5544 389100307391 2600 > 5546 381300302513 NA > 5547 387000307470 NA > 5548 387000307470 NA > 5549 387000307470 NA > 5550 387000307470 NA > 5551 387000307470 NA > 5552 387000307470 NA > > I want to sum the column 3 by column 2. > I removed NA by calling: > tapply(z[[3]], z[[2]], sum, na.rm=T) > but it does not work. > > then, i used > z1<-z[!is.na(z[[3]],] > and repeat > still doesn't work.
Can you be more explicit about "doesn't work"? ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html