Hello I'm working with a bunch of time series data. The data are downloaded from a server and stored as ascii files prior to reading them into R.
After reading the data sets read into R with no problem and I can us the ts function to coerce them to time series, sometimes this works and sometimes it fails. For example. P38_SubB <- read.table("A:\\Data\\Output\\Sparrow\\Hydro_Data\\P38_Annual.txt", header=TRUE, skip=1, sep=",", stringsAsFactors=FALSE) P38_SubB$GS <- rep(0.85, dim(P38_SubB)[1]) # GS is the ground surface elevation, which is not included in the initial file. P38_SubB$Depth <- as.numeric(P38_SubB$P38_stage) - as.numeric(P38_SubB$GS) # now I subtract the ground surface to calculate water depth P38_SubB.ts <- ts(data=P38_SubB, frequency = (1), start=c(1981, 1), end=c(2009,1)) # Here I convert to a time series plot(P38_SubB.ts,ylab="Mean Annual Water Depth", xlab="Year", main="CSSP Subpopulation B \n Water Depth P38") These lines work. But these do not: R3110_SubC <- read.table("A:\\Data\\Output\\Sparrow\\Hydro_Data\\R3110_Annual.txt", header=TRUE, skip=1, sep=",", stringsAsFactors=FALSE) R3110_SubC$GS <- rep(5.10, dim(R3110_SubC)[1]) R3110_SubC$Depth <- as.numeric(R3110_SubC$R3110_stage) - as.numeric(R3110_SubC$GS) R3110_SubC.ts <- ts(data=R3110_SubC, frequency = (1), start=c(1984, 1), end=c(2009, 1)) Warning message: NAs introduced by coercion I am asured that the input data are the same in each input file, yet some coerce correctly while others result in the error which prevents plotting. Are there any known issues with ts, what are the suggested solutions? Thanks Steve Friedman Ph. D. Spatial Statistical Analyst Everglades and Dry Tortugas National Park 950 N Krome Ave (3rd Floor) Homestead, Florida 33034 steve_fried...@nps.gov Office (305) 224 - 4282 Fax (305) 224 - 4147 ______________________________________________ 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.