The message is referring to the format of your input data. The package needs a matrix or vector format. I suggest using this: xm<- as.matrix(x) return.modwt<-modwt(xm, filter="la8", n.levels=5, boundary="periodic", fast=TRUE) -- View this message in context: http://r.789695.n4.nabble.com/wavelet-Variance-Error-tp4301149p4650871.html Sent from the R help mailing list archive at Nabble.com.