Hi,
I have a script I can run step by step through the R interpreter and it works
fine. I then run as a shell script with Rscript and it fails.
The error message comes when I am creating a model matrix with
model.matrix.default().
Error in `contrasts<-`(`*tmp*`, value = "contr.Treatment") :
could not find function "is"
Calls: model.matrix.default -> contrasts<-
I included the following command at the beginning of my Rscript :
cat("Looking for environment(is): ", environment(is), "\n")
and I received the same error message:
Error in environment(is) : object 'is' not found
Calls: cat -> environment
At the command line (through the R interpreter) the same command returns:
> environment(is)
<environment: namespace:methods>
Rscript is not loading the methods package and I don't know how to fix this.
Why would this be happening and how can I prevent it in the future?
I am running the following R session at the command line:
> sessionInfo()
R version 2.10.1 (2009-12-14)
x86_64-pc-linux-gnu
locale:
[1] LC_CTYPE=en_CA.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_CA.UTF-8 LC_COLLATE=en_CA.UTF-8
[5] LC_MONETARY=C LC_MESSAGES=en_CA.UTF-8
[7] LC_PAPER=en_CA.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_CA.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
Here is what I get when I run sessionInfo() from Rscript
R version 2.10.1 (2009-12-14)
x86_64-pc-linux-gnu
locale:
[1] LC_CTYPE=en_CA.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_CA.UTF-8 LC_COLLATE=en_CA.UTF-8
[5] LC_MONETARY=C LC_MESSAGES=en_CA.UTF-8
[7] LC_PAPER=en_CA.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_CA.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets base
The version of Rscript I am running is:
$ Rscript --version
R scripting front-end version 49838
Thank you for your help
Peter
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