How do I stack raster files in R?

Question

I am trying to perform a raster stack using three spatial raster that are in .grd format, in R using the dismo package.The three grid files are in the path "D:~" . I am using this code,

files= list.files(path = "D:~",pattern = 'grd',full.names = TRUE) the error output am getting is

Error in x[[1]] : subscript out of bounds

Can anyone help? thanks in advance

Answer 1

If the files are in sub-directories then you can use recursive=TRUE :

files <- list.files(path="D:", pattern="grd", all.files=FALSE, full.names=TRUE,recursive=TRUE)
s <- stack(files)

Answer 2

Simply use the stack function from the raster package:

files=c("layer1.grd", "layer2.grd", "layer3.grd") 
library(raster)
raster_stack=stack(files)