[R-sig-eco] error in layernames and RasterStack

[Alok K. Bohara]

Hi:  I am trying to replicate  some commands in maxlike. 


#***
library(raster)

set.seed(131)
x1 <- sort(rnorm(100))
x1 <- raster(outer(x1, x1), xmn=0, xmx=100, ymn=0, ymx=100)
x2 <- raster(matrix(runif(1e4), 100, 100), 0, 100, 0, 100)
x3 <- raster(matrix(c(0,1), 100, 100), 0, 100, 0, 100)
r <- stack(x1, x2, x3)
r at layernames <- c("x1", "x2", "x3")

#****

Error #1:  After the last line, I get an Error:

Error in checkSlotAssignment(object, name, value) : 
  ‘layernames’ is not a slot in class “RasterStack”
> 



Error # 2:  Later, I also get an error:

In addition: Warning message:
> fm2 <- maxlike(~x1 + x2 + x3, r, xy)
Error in maxlike(~x1 + x2 + x3, r, xy) : 
  at least 1 covariate in the formula is not in rasters.

In layerNames(rasters) :
  the layerNames function is obsolete. Use "names" instead



I am using  R 2.15.2.  I do not know if the error #2 is the result of the error #1.    Thanks.



Best,
Alok K. Bohara, 
UNM