for loop for raster class

Hi,
I am trying to crop images using raster library it works fine but when i
put that on loop it does not work
my syntax is
febb3<-raster("C:/landsat/New
Landsat/February/L5146041_04120110201_B30.tif")
febb4<-raster("C:/landsat/New
Landsat/February/L5146041_04120110201_B40.tif")
.
.
.
.
so on
msk<-raster("C:/landsat/mask.tif")
ls.im<-c(x1=janb3,x2=janb4,x3=febb3,x4=febb4,x5=octb3,x6=octb4,x7=novb3,x8=novb4,x9=decb3,x10=decb4)

ls.em<-c(1:10)
#for loop
for (i in 1:1){ls.em<-crop(ls.im[i],msk)}
error
Error in function (classes, fdef, mtable)  :
 unable to find an inherited method for function "crop", for signature
"list"
I think there is a problem with the c or list function for concatenating
all the images. I tried few things but no luck.
Any help would be highly appreciated.

Regards,
Vikram.

The error message suggests ls.im is a list; your script would be easier
to understand (for me) if you used

ls.im = list(x1=janb3,...,x10=decb4)

If ls.im is a list, you need to pass ls.im[[i]] to crop, which is a list
element (a raster), whereas ls.im[i] is a list (with one element).

On 01/12/2012 12:50 PM, Vikram Ranga wrote:

Hi,
I am trying to crop images using raster library it works fine but when i
put that on loop it does not work
my syntax is
febb3<-raster("C:/landsat/New
Landsat/February/L5146041_04120110201_B30.tif")
febb4<-raster("C:/landsat/New
Landsat/February/L5146041_04120110201_B40.tif")
.
.
.
.
so on
msk<-raster("C:/landsat/mask.tif")
ls.im<-c(x1=janb3,x2=janb4,x3=febb3,x4=febb4,x5=octb3,x6=octb4,x7=novb3,x8=novb4,x9=decb3,x10=decb4)

ls.em<-c(1:10)
#for loop
for (i in 1:1){ls.em<-crop(ls.im[i],msk)}
error
Error in function (classes, fdef, mtable)  :
  unable to find an inherited method for function "crop", for signature
"list"
I think there is a problem with the c or list function for concatenating
all the images. I tried few things but no luck.
Any help would be highly appreciated.

Regards,
Vikram.