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

[Baldwin, Jim -FS]

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:bohara at unm.edu] 
Sent: Friday, December 07, 2012 7:03 AM
To: Baldwin, Jim -FS; r-sig-ecology at 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  the layerNames function is obsolete.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 [jbaldwin at fs.fed.us]
Sent: Thursday, December 06, 2012 11:46 AM
To: Alok K. Bohara; r-sig-ecology at r-project.org
Subject: RE: error in layernames and RasterStack

I think you might want

      names(r) <-  c("x1", "x2", "x3")

rather than

      r at layernames <- c("x1", "x2", "x3")

Jim


-----Original Message-----
From: r-sig-ecology-bounces at r-project.org [mailto:r-sig-ecology-bounces at r-project.org] On Behalf Of Alok K. Bohara
Sent: Thursday, December 06, 2012 10:26 AM
To: r-sig-ecology at 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 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

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