Maybe I should rephrase my question. What would be the best way to read a
list of filenames and headings from a csv file?
The CSV file is structured as two columns, with column one being the
filename and column two being a heading e.g.:
ANA110915004A_3PERIOD_TmAvg-rdata.csv,Pre-DA
ANA110915006A_3PERIOD_TmAvg-rdata.csv,DA-10^-6
ANA110915012A_3PERIOD_TmAvg-rdata.csv,DA-10^-4
ANA110915016A_3PERIOD_TmAvg-rdata.csv,Washout
I want to be able to open the file using read.csv and use the heading as
the header of a graph.
Reading the filenames from the directory with list.files() works but then I
don't have the headings that go with the file e.g.:
filenames<-list.files(pattern="*.csv")
for (i in seq_along(filenames)) {
con<-read.csv(filenames[i], headers=TRUE, sep=',')
}
Regards
Jannetta
On 11 July 2013 13:27, peter dalgaard <pda...@gmail.com> wrote:
>
> On Jul 11, 2013, at 13:50 , Dante.py wrote:
>
> > Maybe you should set parameter "as.is" in read.csv to be false.
>
> TRUE more likely... However, there's another issue: files[i,] is a data
> frame, therefore so is f[1] (a telltale sign is that it has rows and column
> labels). So f[[1]] is probably needed.
>
> >
> >
> > 2013/7/11 Jannetta Steyn <janne...@henning.org>
> >
> >> Hi Folks
> >>
> >> I can't see what I have done wrong in this piece of code.
> >>
> >> # Read filenames from csv file
> >> files <- read.csv(file="files.csv",head=FALSE,sep=",")
> >>
> >> # for each filename read the file
> >> for (i in 1:length(files)) {
> >> # f becomes the next row inthe file
> >> f<-files[i,]
> >> # the header to be used for the graph is in column 2 of f
> >> head=f[2]
> >> par(mfrow=c(4,2))
> >> # the filename to be used is in column 1 of f
> >> con<-read.csv(file=f[1], header=TRUE, sep=',')
> >> tmp<-con$value2
> >> data<-normalize_js(tmp,-1,1)
> >> time<-con$time
> >> # run the waveform analyser
> >> waveformanalyser(data,time,head)
> >> }
> >>
> >> I get an error:
> >> Error in read.table(file = file, header = header, sep = sep, quote =
> quote,
> >> :
> >> 'file' must be a character string or connection
> >>
> >> When the error occurs f equals:
> >>> f
> >> V1 V2
> >> 1 ANA110915004A_3PERIOD_TmAvg-rdata.csv Pre-DA
> >>
> >> and f[1] equals:
> >>
> >>> f[1]
> >> V1
> >> 1 ANA110915004A_3PERIOD_TmAvg-rdata.csv
> >>
> >>
> >> Why won't it use the value of f[1] as a string for the file parameter in
> >> the read.csv line?
> >>
> >> All help would be apprecitated.
> >> Regards
> >> Jannetta
> >>
> >>
> >>
> >> --
> >>
> >> ===================================
> >> Web site: http://www.jannetta.com
> >> Email: janne...@henning.org
> >> ===================================
> >>
> >> [[alternative HTML version deleted]]
> >>
> >> ______________________________________________
> >> 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.
> >>
> >
> >
> >
> > --
> > ÃÃ
êà Dante.py
> > Ãâ¹Ãâ´óç09϶Ãâ¡Ã§ÃëÃÅÃÃÃâ¡Ã§â¨Ãµ
> > ¸öÃÃÃ÷Ã⣺http://dantepy.yslsg.org/
> >
> > [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > 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.
>
> --
> Peter Dalgaard, Professor,
> Center for Statistics, Copenhagen Business School
> Solbjerg Plads 3, 2000 Frederiksberg, Denmark
> Phone: (+45)38153501
> Email: pd....@cbs.dk Priv: pda...@gmail.com
>
>
>
>
>
>
>
>
>
--
===================================
Web site: http://www.jannetta.com
Email: janne...@henning.org
===================================
--
===================================
Web site: http://www.jannetta.com
Email: janne...@henning.org
===================================
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