[R-sig-Geo] paste(" /" ") and paste(" /' ") for grass command

[Agustin Lobo]

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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