[GRASS-user] i.pca gives error

[Martin van Brakel]

that helps but it breaks there...


GRASS 7.0.svn> i.pca --overwrite input=pca output_prefix=_msub
Computing covariance matrix...
 100%
Calculating principal components...
 100%
Rescaling to range 0,255...
 100%
Eigen values, (vectors), and [percent importance]:
GRASS 7.0.svn>


On Fri, Apr 4, 2014 at 5:44 PM, Markus Neteler <neteler at osgeo.org> wrote:

> On Fri, Apr 4, 2014 at 1:47 PM, Martin van Brakel
> <m.l.vanbrakel at gmail.com> wrote:
> > Hi list,
> >
> > i am processing plenty of modis subsets into a group called "pca"
> >
> > when using WinGRASS it gives an error
> >
> > GRASS 7.0.svn> i.pca --overwrite input=pca output_prefix=_msub
> > Computing covariance matrix...
> >  100%
> > ERROR: No non-null values
> > GRASS 7.0.svn>
>
> Did you set the computational region to the map beforehand?
>
> g.region rast=pca -p
>
> then
> i.pca ...
>
> See also:
> http://grasswiki.osgeo.org/wiki/Computational_region
> Since we currently have issues on the server (slow), see also the wiki
> mirror at:
> http://grass.fsv.cvut.cz/wiki-mirror/index.php/Computational_region
>
> hope this helps
> Markus
>
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