[Qgis-developer] More ideas about package installation in R for SEXTANTE

[Tim Sutton]

Hi

More broadly, it would also be nice if R could be provided 'out of the box'
in our standalone installer for windows (and osgeo4w too I guess) - I know
the complicated installation process prevents many users from 'giving it a
try'.

Regards

Tim


On Wed, Jul 17, 2013 at 9:22 PM, Victor Olaya <volayaf at gmail.com> wrote:

> Hi all
>
> We have been discussing some issues with packages in R, and I would
> like to share some ideas wth you
>
> The goal is to make package installation as easy and practical as
> possible, so scripts can run with minor settings
>
> I am thinking that a good solution would be to check for packages
> needed by a script, checking calls to library(). With that, package
> installation commands could be included, as it is done now with rgdal
> and raster, with a code like this
>
> 'tryCatch(find.package("rgdal"), error=function(e)
> install.packages("rgdal", dependencies=TRUE))')
>
> replace "rgdal" with the lib the script uses...and it should be fine,
> right?
>
> two problems in here:
>
> 1) if the user has no permissions that will not work, but I can
> implement a way of checking what is needed and what is installed in
> case the algorithm fails, so I can inform the user to manually install
> the reuqired packages
>
> 2)to avoid installing things automatically, for users that might not
> like that behaviour, this can be turned off, so manual intallation is
> required.
>
> All this would go on the default lib path, since we agreed that it is
> a better option than having a custom one that might duplicate packages
>
> Comments are welcome
>
> Thanks in advance!
>
> Victor
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>



-- 
Tim Sutton - QGIS Project Steering Committee Member (Release  Manager)
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