Hi,
I think you used a column that doesn't exist in the dataset. Targetstation <- read.table(text="V1 V2 V3 V4 V5 V6 V7 0 0 0 1.2 0 0 0.259 0 0 12.8 0 23.7 0 8.495 6 0 81.7 0.2 0 20 19.937 0 1.5 60.9 0 0 15.5 13.900 1 13 56.8 17.5 32.8 6.4 27.654 4 3 66.4 2 0.3 NA 17.145",sep="",header=TRUE) within(Targetstation, V6 <- replace(V6,is.na(V6),V7[is.na(V6)])) V1 V2 V3 V4 V5 V6 V7 1 0 0.0 0.0 1.2 0.0 0.000 0.259 2 0 0.0 12.8 0.0 23.7 0.000 8.495 3 6 0.0 81.7 0.2 0.0 20.000 19.937 4 0 1.5 60.9 0.0 0.0 15.500 13.900 5 1 13.0 56.8 17.5 32.8 6.400 27.654 6 4 3.0 66.4 2.0 0.3 17.145 17.145 #if you use: !is.na(Targetstation$v6) #'v6' and 'V6' are different logical(0) Warning message: In is.na(Targetstation$v6) : is.na() applied to non-(list or vector) of type 'NULL' A.K. On Thursday, November 14, 2013 2:26 AM, dila radi <dilarad...@gmail.com> wrote: Hi all, I have a data set which treat missing value as NA and now I need to replace all these NA's by using number in the same row but different column. Here is the part of my data: V1 V2 V3 V4 V5 V6 V7 0 0 0 1.2 0 0 0.259 0 0 12.8 0 23.7 0 8.495 6 0 81.7 0.2 0 20 19.937 0 1.5 60.9 0 0 15.5 13.900 1 13 56.8 17.5 32.8 6.4 27.654 4 3 66.4 2 0.3 NA 17.145 I want to replace (V6, 6) with (V7, 6). I have about 1000 NA's in V6 which I want to replace with the same row in V7. The other values in V6, I want to keep remain the same. How to achieve this? Assuming my data is called "Targetstation", I have tried this: Targetstation <- within(Targetstation, v6 <- replace(v6, is.na(v6), v7[is.na (v6)])) But R gives me this: Warning messages: 1: In is.na(v6) : is.na() applied to non-(list or vector) of type 'NULL' 2: In is.na(v6) : is.na() applied to non-(list or vector) of type 'NULL' How to solve this? Thank you in advance. Regards, Dila. [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org 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@r-project.org 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.