[GRASS-user] i.gensig

[Markus Neteler]

On Fri, Oct 24, 2008 at 10:57 AM, Manuel Seeger <seeger at uni-trier.de> wrote:
> Hello all,
>
> I using grass 6.3.0 on a 64 machine (ubuntu 7.10)
> When applying i.gensig on a set of 20 rasters for defining 6 different
> groups I get the following output:
> Finding training classes ...
> 6 classes.
> Calculating class means ...
> Calculating class covariance matrices...
>
> Signature [1] not invertible.
>
> Signature [2] not invertible.
>
> Signature [3] not invertible.
>
> Signature [4] not invertible.
>
> Signature [5] not invertible.
>
> Signature [6] not invertible.
>
> Writing signature file [DRP_Zemmer] ...
>
> Done.
>
> The problem is:
> the signature file is empty.
> it may be related to the info Signature [1] not invertible. But I don't know
> what GRASS wants to tell me.

I am not sure what happens - apparently
 imagery/i.gensig/can_invert.c
fails. Could you try to reduce the number of input maps for
a test?

Markus