[R] try()-function does not catch error in BATCH-job if Matrix is loaded

[luke-tierney at uiowa.edu]

This is due to long-staning issue in methods internals, which are
involved because loading Matrix shadows base::mean with Matrix::mean.
A work-around has been in place in R_devel for some time; a proper fix
may come at some point in the future. So if your real code doesn't
need the moficied mean from Matrix you can use base::mean; otherwise
you will have to use an R-devel snapshot.

Best,

luke

On Mon, 7 Jan 2013, Sarah Brockhaus wrote:

> Hello,
>
> In my simulation I use the try()-function to catch possible errors when 
> fitting models. I run the simulationon a Linux-server using the command " R 
> CMD BATCH nameOfFile.R &".  When executing the code as batch-job I get the 
> problem that the execution is halted without giving an error message. But 
> when I run the code interactivly the error is catched by try() as it would be 
> expected.
>
> The problem is somewhat strange as it only occurs when the code is executed 
> as a batch-job and when the package "Matrix" is loaded.
>
> I wrote a small example reproducing the error. (In my code the error occurs 
> in mgcv:::fixDependence, which looks like the code I'm using below in order 
> to get a small reproducible example. I realized that the code  makes no 
> sense...)
>
> ######################################
> library(Matrix)
>
> R <- matrix(abs(rnorm(25)), 5, 5)
> r0 <- r <- nrow(R)
>
> # while-loop produces error that should be catched by the function try()
> try(
> while (mean(R[r0:r, r0:r]) > 0) r0 <- r0 - 1
> )
>
> # so "Hello" should be printed
> print("Hello")
> ######################################
>
> I use R version 2.15.1 (2012-06-22) on a x86_64-pc-linux-gnu (64-bit) 
> platform.
>
> I would be grateful for help.
>
> Best regards,
> Sarah Brockhaus
>
> PHD-student
> Department of Statistics
> University of Munich
>
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

-- 
Luke Tierney
Chair, Statistics and Actuarial Science
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa                  Phone:             319-335-3386
Department of Statistics and        Fax:               319-335-3017
    Actuarial Science
241 Schaeffer Hall                  email:   luke-tierney at uiowa.edu
Iowa City, IA 52242                 WWW:  http://www.stat.uiowa.edu