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...est advice I can give you is to load the data frame X1 as in your code above, and try something like: which.na<-function(x) return(which(is.na(x))) sapply(X1,which.na) You will then get a list of the positions of any NA values in X1. Jim On Fri, Nov 24, 2017 at 7:45 PM, Elham Fakharizade <e_f_sh at yahoo.com> wrote: > Hello Dear Jim > Thanks for your answering > I have more than 65000 data in my file I search for NA or NAN but nothing > find. how can I search for missing value? > Sincerely yours > Elham > > Elham Fakharizadeshirazi. > > Doctoral guest resea...

Hello DearI used modifiedmk package for trend analyses.this is my script ?require(modifiedmk)X1<-read.table("c:/elham/first article/r/Spring_NDVI-1.txt",skip=2,header=FALSE)d=dim(X1) outMK<-matrix(-999,nrow=4,ncol=d[2])for (c in