[R-sig-Geo] upload waypoint data to Garmin GPS

[Patrick Giraudoux]

James Nylen a écrit :
> The easiest thing to do is probably to write the data.frame to a 
> tab-delimited text file using write.table and then read in the written 
> file like you have done above.  See ?write.table - as I recall there 
> are plenty of options that will allow you to specify the separator, 
> whether or not to write headings, etc.
>  
> -James
This is exactly what I did yesterday (see script below - the function 
uploadEtrex is now at the working stage in a package pgirbirc at 
http://pagesperso-orange.fr/giraudoux/ or 
http://pagesperso-orange.fr/giraudoux/#pgirbric)

However when I think about it, my question was a bit silly: it was 
something as how to send a r-object to a connexion that a batch script 
could read at the operating system level without writing a file on 
disk... I guess there is no solution and the easiest way, indeed, is to 
write a text file and make it read from the shell (which is what the 
current fonction does...).

Thanks anyway for your input,

Patrick


uploadEtrex <- function (df, wcom = 4)
{
    dff <- as.data.frame(matrix(NA, nrow = nrow(df), ncol = 9))
    dff[, c(2, 8, 9)] <- df[, c(1, 3, 2)]
    write.table(dff, "dff", col.names = FALSE, sep = "\t", quote = FALSE)
    if (Sys.info()["sysname"] != "Windows") {
        system(paste("gpsbabel -w -i tabsep -f dff -o garmin -F 
/dev/ttyUSB0",
            sep = ""))
    }
    else {
        system(paste("gpsbabel -w -i tabsep -f dff -o garmin -F com",
            wcom, ":", sep = ""))
    }
}

>
>
>  
> On 11/16/08, *Patrick Giraudoux* <patrick.giraudoux at univ-fcomte.fr 
> <mailto:patrick.giraudoux at univ-fcomte.fr>> wrote:
>
>     Dear listers,
>
>     I am writing a R function to upload waypoints to a GPS Garmin
>     Etrex with  gpsbabel. This works quite well reading from a text
>     file as following:
>
>     df<-"mytabfile.txt"
>     system(paste("gpsbabel -w -i tabsep -f ",df," -o garmin -F
>     com5:",sep=""))
>
>     However, I would prefer to upload from a data.frame within R
>     rather than reading a tab delimited text file on the disk.
>
>     Any idea about how to specify it in the command line (should be
>     trivial, but I cannot figure it out) ?
>
>     Thanks in advance,
>
>     Patrick
>
>
>
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>

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