[R] loading data from a specified directory

[Henrik Bengtsson]

See ?assign

/Henrik Bengtsson

> -----Original Message-----
> From: owner-r-help at stat.math.ethz.ch
> [mailto:owner-r-help at stat.math.ethz.ch]On Behalf Of Sam McClatchie
> Sent: Monday, September 09, 2002 5:47 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] loading data from a specified directory
>
>
> System info:
> Linux slackware
> R Version 1.5.1  (2002-06-17)
> ESS 5.1.21
> Emacs 21.2.1
> -------------------
> Colleagues
>
> I have some text files in a certain directory and want to process them
> sequentially. So I want to pass the filename identifier into a function
> and loop through the processing of each file in turn.I've called the
> file identifier f in this code segment:
>
> image.dvm <- function (horiz.slice.int=2, ping.int=3,
>                         start.h=3, start.min=4,
>                         max.z=800, f=350:372)
> {
>    ## Purpose: to display the whole echogram integrals for
> consecutive CREST
>    ## files to illustrate patterns of diel vertical migration
>    ##
> ----------------------------------------------------------------------
>    ## Arguments:
>    ##
> ----------------------------------------------------------------------
>    ## Author: Sam McClatchie, Date:  6 Sep 2002, 12:02
>
>
>    for (i in 1:length(f))
>        paste("t.",f[1], sep="")
> <-read.table(paste("/home/smc/manuscripts/mesopelagic_fish/biomass
> _spectrum/we0000",f[1],sep=""),
> header=F)
>
> -----------------
> There is nothing wrong with the text files because I can read them
> correctly with:
>  > t.350 <- read.table('we0000350', header=F)
>  > t.350[1:5,1:4]
>             V1         V2         V3          V4
> 1 0.00000e+00 0.0000e+00 0.0000e+00 0.00000e+00
> 2 0.00000e+00 0.0000e+00 0.0000e+00 0.00000e+00
> 3 0.00000e+00 0.0000e+00 0.0000e+00 0.00000e+00
> 4 0.00000e+00 0.0000e+00 0.0000e+00 0.00000e+00
> 5 8.71053e-05 4.2294e-05 3.6614e-05 6.68651e-05
>  >
> However, running the code segment above gives an error that has me a
> little bemused:
>
>  > image.dvm()
> Error in image.dvm() : Target of assignment expands to non-language object
>  >
>
> I guess I'm doing something illegal with the paste command?
>
>    paste("t.",f[1], sep="") <- read.table....
>
> Can you help, please?
>
> Sam
> --
> Sam McClatchie, Research scientist (fisheries acoustics))))))))))
> NIWA (National Institute of Water & Atmospheric Research Ltd)
> PO Box 14 901, Kilbirnie, Wellington, New Zealand
> s.mcclatchie at niwa.cri.nz
> Research home page <http://www.smcc.150m.com/>
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