Re: [R] tapply

From: Douglas Bates <dmbates_at_gmail.com>
Date: Tue 21 Jun 2005 - 09:49:59 EST

On 6/20/05, Weiwei Shi <helprhelp@gmail.com> 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 Received on Tue Jun 21 10:01:59 2005

This archive was generated by hypermail 2.1.8 : Fri 03 Mar 2006 - 03:32:54 EST