sdm package

[rayan emad]

Dear all 

please just i try to practice with sdm package in R for Robert J. Hijmans and Jane Elith, when I try to apply this code ((backgr <- randomPoints(predictors, 500)) on my own data it is gave me this error (Error: could not find function "randomPoints") i download all package (ps, dismo, raster, library(maptools), but still i can run this code if any face this problem i hope he/she can help me.

regards

Emad

[Ahmed El-Gabbas]

Dear Emad,
 
randomPoints function comes from the dismo package not sdm, so try loading the package first and re-run the function:
library(dismo)
(backgr <- randomPoints(predictors, 500)
 
# An example:
library(raster)
library(dismo)
f <- system.file("external/test.grd", package="raster")
r <- raster(f)
RP <- randomPoints(mask = r, n = 200)
plot(r)
points(RP)

Hope it works with you,
Cheers,
Ahmed