Dear All,
I am experiencing some problems in resetting the values of some selected
elements in a dataframe.
Consider
d<-seq(-1,1,length=16)
dim(d)<-c(4,4)
d<-as.data.frame(d)
sel_pos<-which(d>0, arr.ind=TRUE)
d[sel_pos]<- -9
which returns the error
Error in `[<-.data.frame`(`*tmp*`, sel_pos, value = -9) :
only logical matrix subscripts are allowed in replacement
which is obscure to me. I am correctly selecting the positive elements
in a data.frame and I'd like to reset them to another numerical value.
What I am misunderstanding?
Many thanks
Lorenzo
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