On 2010-07-16 13:38, Jared Stabach wrote:
I've seen a few threads about this, but none that seem to answer my problemI have a list of .txt files in a directory that I am reading into R and row binding together. I am using the following code to do so: # Directory where files are found my.txt.file.directory<- "C:/Jared/Data/Kenya/Wildebeest/Tracking_Data" names.of.txt.files<- list.files(my.txt.file.directory,pattern="all_data",ignore.case=TRUE, full.names=TRUE) # Print names that meet criteria in directory names.of.txt.files # The names.of.txt.files will be a vector with the names of all the txt files # Dataset will contain all the data in the directory wildebeest<- NULL # Run loop for (i in 1:length(names.of.txt.files)) { dat<- read.table(names.of.txt.files[i],header=FALSE) # Row bind all data together into a file called 'wildebeest' wildebeest<- rbind.data.frame(wildebeest,dat) rm(dat) } When I run this script, I get an error such as: 18: In `[<-.factor`(`*tmp*`, ri, value = c(1714.36, 1711.27, ... : invalid factor level, NAs generated I think I have identified the problem such that when I identify the structure of some of the files that I am reading in, columns are labeled as "Factors". In other files, the same columns are labeled as numeric values. Is there a way to assign the data structure to these columns in the dataframe as they are being read in? Any other suggestions to why I am getting this error is appreciated. Jared
Jared, I'd guess that you have invalid data in some of your files. Perhaps missing values coded as '*' or as 'N/A'. If so, set the na.strings= argument. -Peter Ehlers ______________________________________________ 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.
