That gives you a vector, not a data frame. The problem is that the object returned by tapply is a 1-d array of list. When as.data.frame() is called, the default method doesn't know how to handle arrays and gives the error. What you really want for this particular case is to treat the object as a list, so the unorthodox way is:
as.data.frame.list(xb) OK, I didn't really say that... Andy > From: Andrew Robinson > > Wolfram, > > try > > unlist(xb) > > Andrew > > On Wednesday 10 March 2004 06:58, Wolfram Fischer wrote: > > I have two lists: > > > > xa <- list( X=c(1,2,3), Y=c(4,5,6), Z=c(7,8,9) ) > > > > xb <- with( barley, tapply( X=seq(1:nrow(barley)), INDEX=site > > , FUN=function(z)yield[z])) > > > > I can convert xa to a dataframe easily with: > > as.data.frame(xa) > > > > But if i try the same with xb I get: > > as.data.frame(xb) > > Error in as.data.frame.default(xb) : > > can't coerce array into a data.frame > > > > What helps? > > > > (NB: I know the formula for xb is stupid, but it generates the same > > type of list as the list I get from my real problem.) > > > > Wolfram > > > > ______________________________________________ > > [EMAIL PROTECTED] mailing list > > https://www.stat.math.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide! > > http://www.R-project.org/posting-guide.html > > -- > Andrew Robinson Ph: 208 885 7115 > Department of Forest Resources Fa: 208 885 6226 > University of Idaho E : [EMAIL PROTECTED] > PO Box 441133 W : > http://www.uidaho.edu/~andrewr > Moscow ID 83843 > Or: http://www.biometrics.uidaho.edu > No statement above necessarily represents my employer's opinion. > > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > > ------------------------------------------------------------------------------ Notice: This e-mail message, together with any attachments,...{{dropped}} ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
