[R] $ operator is invalid for atomic vectors

[agrins]

HI all- 

I have used this .fun in S+ without a problem however, in R when I run this
code to generate multiple graphs:

trendplot<-function(datafr,dataf2, abbrev="", titlestr="",
devname="s",filen="",styr=1990,endyr=2012) {
if (!is.null(dev.list())) {dev.off()}

dataf<-datafr[datafr$abbrev==abbrev,]			#subset entire dataset with one
species at a time
dataf2sp<-dataf2[dataf2$abbrev==abbrev,]  etc... 

It returns  "Error in dataf2$abbrev : $ operator is invalid for atomic
vectors"

Is there an easy fix for this error?

Thanks for the help- 

Alexis




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