na.approx uses approx and has the same behavior as it. Try this: > library(zoo) > > # test data > z <- zoo(matrix(1:24, 6)) > z[,2:3] <- NA > z[1, 2] <- 3 > z[2, 1] <- NA > z
1 1 3 NA 19 2 NA NA NA 20 3 3 NA NA 21 4 4 NA NA 22 5 5 NA NA 23 6 6 NA NA 24 > > # TRUE for each column that has more than 1 non-NA > idx <- colSums(!!z, na.rm = TRUE) > 1 > idx [1] TRUE FALSE FALSE TRUE > > z[,idx] <- na.approx(z[,idx]) > z 1 1 3 NA 19 2 2 NA NA 20 3 3 NA NA 21 4 4 NA NA 22 5 5 NA NA 23 6 6 NA NA 24 On 5/27/07, antonio rodriguez <[EMAIL PROTECTED]> wrote: > Hi, > > I have a object 'zoo': > > dim(zz) > [1] 720 5551 > > where some columns only have NA's values (representing land data in a > sea surface temperature dataset) I find straightforward the use of > 'na.approx' for individual columns from the zz matrix, but when applied > to the whole matrix: > > zz.approx<-na.approx(zz) > Erro en approx(along[!na], y[!na], along[na], ...) : > need at least two non-NA values to interpolate > > The message is clear, but how do I could skip those 'full-NA's' columns > from the interpolation in order to perform the analysis over the columns > which represent actual data with some NA's values > > Best regards, > > Antonio > > -- > ===== > Por favor, si me mandas correos con copia a varias personas, > pon mi dirección de correo en copia oculta (CCO), para evitar > que acabe en montones de sitios, eliminando mi privacidad, > favoreciendo la propagación de virus y la proliferación del SPAM. Gracias. > ----- > If you send me e-mail which has also been sent to several other people, > kindly mark my address as blind-carbon-copy (or BCC), to avoid its > distribution, which affects my privacy, increases the likelihood of > spreading viruses, and leads to more SPAM. Thanks. > ===== > Antes de imprimir este e-mail piense bien si es necesario hacerlo: El > medioambiente es cosa de todos. > Before printing this email, assess if it is really needed. > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.