On Tue, 20 Jan 2009, Agustin Lobo wrote:
Hi!
I have an script in R that mostly controls the
flow of grass commands through system()
I've got stuck at:
for (k in mistat[,1]){
system("r.mapcalc 'mancha = if(manchas.clmp==k,1,0)'")
is there any way I could pass the value of k to r.mapcalc?
I was thinking on using the shell through system, something like
for (k in mistat[,1]){
system("set k = @1")
system("r.mapcalc 'mancha = if(manchas.clmp==$k,1,0)'")
but do not get thru,
(perhaps I'm mixing my memories of the csh and the Bourne shell...)
Please don't cross-post - people may not be subscribed to both lists and
this may break threads.
The answer is paste(), or possibly a formatting function:
cmd <- paste("r.mapcalc \'mancha = if(manchas.clmp==", formatC(k, ...),
",1,0)\'", sep="")
cmd
cat(cmd, "\n")
system(cmd)
if you need more control of the string going to system(); in my
experience, eyeballing cmd is very helpful.
Roger
any help?
Agus
--
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: [email protected]
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