データ フレームを溶かそうとすると、この奇妙なエラーが発生します。理由はありますか?
str(zx7)
'data.frame': 519 obs. of 5 variables:
$ calday.new: Date, format: "2011-01-03" "2011-01-04" "2011-01-05" "2011-01-06" ...
$ A20 : Time-Series from 1 to 519: 0 0 0 0 0 0 0 0 0 0 ...
$ B20 : Time-Series from 1 to 519: 0 0 0 0 0 0 0 0 0 0 ...
$ C20 : Time-Series from 1 to 519: 0 0 0 0 0 0 0 0 0 0 ...
$ D20 : Time-Series from 1 to 519: 0 0 0 0 0 0 0 0 0 0 ...
zx7.melt <- melt(zx7, id=c("calday.new"))
Error in `[<-.ts`(`*tmp*`, ri, value = c(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, : only replacement of elements is allowed