True. Also, actually grass accepts where='(GRIDCODE = 11917)', so the
practical problem is solved.
Nevertheless, I find odd the different behavior of
paste("\"","Hola","\"",sep="")
and
paste("\'","Hola","\'",sep="")
the former printing the \
while the second one does not.
Thanks!
Agus
Jaime R. Garcia Marquez wrote:
Dear Agustin,
I think that using the script paste("\"","Hola","\"",sep="") will do
the job anyway. Yes, you would get "\"Hola\"" as a result but when you
pass the script to GRASS the \ symbol will not be considered and so
you will get the string you are looking for.
a <- "v.extract codigo_Montseny07_clump"
b <- paste("out=extract", 11917, sep="")
c <- paste("(GRIDCODE = ", 11917, ")", sep="")
c <- paste("where=\"", c, "\"",sep="")
string <- paste(a,b,c, sep=" ")
system(string)
string
[1] "v.extract codigo_Montseny07_clump out=extract11917
where=\"(GRIDCODE = 11917)\""
When the command is read in GRASS the \ symbol will mean move to the
next line in the console.
Best,
Jaime -R
On Wed, 22 Apr 2009 10:31:55 +0200, Agustin Lobo
<alobolis...@gmail.com> wrote:
I wish to write "" using paste(), but
paste("\"","Hola","\"",sep="")
[1] "\"Hola\""
while the same approach works with ''
paste("\'","Hola","\'",sep="")
[1] "'Hola'"
why this difference? how could I do it to get "Hola" ?
I need this to write this string in R:
v.extract codigo_Montseny07_clump out=extract11917 where="(GRIDCODE =
11917)"
and pass it to grass. Something like:
for (i in polis){
system("g.region vect=codigo_Montseny07_clump")
nomextract <- paste("extract",i,sep="")
grcomm <- paste("v.extract codigo_Montseny07_clump out=",nomextract,
" where=\"(GRIDCODE = ",i,")\" ",sep="")
system(grcomm)
...
Thanks
Agus
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begin:vcard
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email;internet:agustin.l...@ija.csic.es
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