Yes, this is problem. Thanks for the suggestion. I had deleted the N/A
values later in the script but should have taken care of them in this first
step.
Thanks very much
Jared
On Fri, Jul 16, 2010 at 4:11 PM, Peter Ehlers <ehl...@ucalgary.ca> wrote:
> On 2010-07-16 13:38, Jared Stabach wrote:
>
>> I've seen a few threads about this, but none that seem to answer my
>> problem
>>
>> I 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
>
>
>
--
Jared Stabach
PhD Student
Natural Resource Ecology Laboratory
Colorado State University
Room B226 NESB
Fort Collins, CO 80523-1499
jstab...@rams.colostate.edu
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