On Sep 21, 2009, at 12:19 PM, Cynthia Sadler wrote:
Hi,
I'm trying to read data from a collection of CSV files for
processing and graphing. All of my files begin with "modrate" and
end with ".csv". I think I have the regex working but I am stumped
at trying to get read.table to work within an if statement.
This works:
> filepattern="modrate*"
> files <- list.files(pattern=filepattern)
> data <- read.table(files[1], header=TRUE, sep=",")
But I cannot get this to work:
> for (i in seq(along=files)) {
+ data <- read.table(files[i], header=TRUE, sep=",")
+ }
Error in make.names(col.names, unique = TRUE) :
invalid multibyte string at '<ff><d8><ff><e0>'
The error message suggests that you might have strange characters in
your header lines which make.names() is choking on. What is the
result of substituting readLines with parameter of n=1 for the
read.table() call on those files? Or perhaps you should be using "[["
rather than "[" to access the files list?
I'm sure I'm making a newbie mistake here.
Despite several years, I still consider myself a newbie.
I'm using R version 2.9.2 (2009-08-24) on Mac OS X, and didn't find
anything about this in the help archives (though, as I'm new to
this, I may not have searched in the best way). Any advice? Thanks.
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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