[GRASSLIST:5077] i.gensigset

Hallo,
by running i.gensigset, with 19 rasters in subgroup, I got following Error:

    Error: unreliable clustering
    try a smaller initial number of clusters

What does it mean? Where do I set the initial number of clusters?

Thank you

Jachym
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Jachym Cepicky
e-mail: jachym.cepicky@centrum.cz
URL: http://les-ejk.cz
GPG: http://www.fle.czu.cz/~jachym/gnupg_public_key/