Re: [Bugs-r-devel] R2WinBUGS on Solaris

[Gorjanc G. <Gre...@bf...>]

...
>>> 1. The working.directory is assumed to be the same directory as the
>>> model.file and setting working.directory to something else doesn't help.
>>
>> Working directory and model.file can be in separate directories, you
>> can you tell me an example where it does not work.
>>
> Doesn't work.  See below:
>
>  > schools.sim <- bugs (data, inits, parameters,
> "/usr/local/doc/r2winbugs/schools.bug",
> +                     n.chains=3, n.iter=1000, working.directory=".")
> Warning message:
> In file.create(to[okay]) :
>   cannot create file '/usr/local/doc/r2winbugs/schools.txt', reason
> 'Permission denied'

Rodney, this is a problem with permissions and not with R2WinBUGS! /usr/local/doc folders
are usually not writable for regular users. If you want to avoid this problem, you can do either:

A. Put modelfile somewhere else. If there will be many users (say a whole class), you do not want
that they will be overwritting the same files, do you? Putting the modelfile to a home folder of each
user, makes much more sense.

B. You also might change the permissions of the  /usr/local/doc/r2winbugs/ folder. Actually, this is needed
since the R2WinBUGS package changes some parameters related to burnin and metropolis acceptance rate in
a file that resides in /usr/local/doc/r2winbugs/. I am not really aware what actually is done, since the code
was written by Andrew Gelman and I just make it sure that some bits run under linux.

So my recommendation is:
- change permissions in /usr/local/doc/r2winbugs/ via chmod -R uga+w /usr/local/doc/r2winbugs/

- make sure that each user is using its own modelfile

Regards, Gregor