[GRASS-user] v.class.mlR error

[James Duffy]

Hi Moritz,

Your suggested edits to v.class.mlR.py worked (except you had one too many
brackets on the end of each line, so I removed those). Once I updated and
saved that script file, the error disappeared.

I have just reinstalled the module using g.extension and tried running
v.class.mlR and I again have the original error regarding escaped slashes.

Kind regards

James



On 25 May 2017 at 09:15, Moritz Lennert <mlennert at club.worldonline.be>
wrote:

> Le Thu, 25 May 2017 00:25:57 +0200,
> Markus Neteler <neteler at osgeo.org> a écrit :
>
> > On Wed, May 24, 2017 at 12:14 PM, James Duffy
> > <james.philip.duffy at gmail.com> wrote:
> > ...
> > > v.class.mlR --verbose segments_map=seg_stats_vec at MAP1
> > ...
> > > My GRASS mapset is located in - C:\Sandbox\RGRASS\TEST\MAP1
> > >
> > > Given that R takes paths with / rather than \, I think the issue
> > > lies at the start of the R part of the script which reads:
> > >
> > > require(caret)
> > > features <-
> > > read.csv("C:\Sandbox\RGRASS\TEST\MAP1\.tmp/unknown\5636.0",
> > > sep="|", header=TRUE, row.names=1) training <-
> > > read.csv("C:\Sandbox\RGRASS\TEST\MAP1\.tmp/unknown\5636.1",
> > > sep="|", header=TRUE, row.names=1)
> > >
> > > I have run v.class.mlR on an osgeolive build before, but not on
> > > Windows. Is this a Windows specific issue that needs addressing?
> >
> > In the script I see things like
> >                 reclass_files[classifier] = tmpfilename.replace("\\",
> > "/")
> >
> > which is probably unhelpful on Windows. Not sure how to make that
> > portable, though.
>
> I had forgotten that I had already done this elsewhere in the
> module... ;-)
>
> It is actually there exactly for Windows: tempfile() creates a path
> with \, but in R these have to either be escaped, or modified into / as
> R (and I think Windows in general) can handle paths with forward
> slashes.
>
> I had answered James, but I now notice that it was from a wrong
> address, so the mail didn't get through to the list.
>
> I've now just comitted a fix using the same technique.
>
> James, can you just reinstall v.class.mlR and try again ?
>
> Moritz
>



-- 
*James Duffy*
PhD Researcher
Environment and Sustainability Institute
Penryn Campus
University of Exeter
Penryn
Cornwall
TR10 9FE
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