That's because the function maxlike explicitly calls "layerNames(rasters)" in
cd.names <- layerNames(rasters)
By typing
maxlike()
you can see the code and find the statement mentioned above. The two fixes are
(1) make your own version of maxlike with the "names" fix and/or write the
developer of maxlike and let him or her know about this issue.
Jim
-----Original Message-----
From: Alok K. Bohara [mailto:boh...@unm.edu]
Sent: Friday, December 07, 2012 7:03 AM
To: Baldwin, Jim -FS; r-sig-ecology@r-project.org
Subject: RE: error in layernames and RasterStack
Thanks Jim. names(r) <-- command worked...
I still get this error although I get the estimates and their standard
errors...
> fm2 <- maxlike(~x1 + x2 + x3, r, xy)
Warning message:
In layerNames(rasters) :
the layerNames function is obsolete. Use "names" instead
Coefficients:
Est SE z P(>|z|)
(Intercept) -0.817 0.221 -3.687 2.27e-04
x1 1.157 0.129 8.987 2.54e-19
x2 0.152 0.190 0.801 4.23e-01
x3 -0.102 0.109 -0.933 3.51e-01
Alok K. Bohara, Ph.D.
UNM
________________________________________
From: Baldwin, Jim -FS [jbald...@fs.fed.us]
Sent: Thursday, December 06, 2012 11:46 AM
To: Alok K. Bohara; r-sig-ecology@r-project.org
Subject: RE: error in layernames and RasterStack
I think you might want
names(r) <- c("x1", "x2", "x3")
rather than
r@layernames <- c("x1", "x2", "x3")
Jim
-----Original Message-----
From: r-sig-ecology-boun...@r-project.org
[mailto:r-sig-ecology-boun...@r-project.org] On Behalf Of Alok K. Bohara
Sent: Thursday, December 06, 2012 10:26 AM
To: r-sig-ecology@r-project.org
Subject: [R-sig-eco] error in layernames and RasterStack
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@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the layerNames function is obsolete.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
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