[GRASSLIST:6351] i.gensigset: not enaugh data points

[Jachym Cepicky]

Hallo,
I have to classify some image data and I want to use i.smap. The clustering
with i.gensigset does not run trough properly:

GRASS6.1.cvs(klasifikace_krkonos):~> i.gensigset tra=training_plo42 group=klas1 subg=okoloplo42 sig=training_plo42                  
Finding training classes ... 100%
5 classes
Reading image data ... 100%
Clustering class 1, with 27218 pixels
Warning: Removed a singular subsignature; number 1; 9 remain
Warning: Removed a singular subsignature; number 1; 8 remain
Warning: Removed a singular subsignature; number 1; 7 remain
Warning: Removed a singular subsignature; number 1; 6 remain
Warning: Removed a singular subsignature; number 1; 5 remain
Warning: Removed a singular subsignature; number 1; 4 remain
Warning: Removed a singular subsignature; number 1; 3 remain
Warning: Removed a singular subsignature; number 1; 2 remain
Warning: Removed a singular subsignature; number 1; 1 remain

Error: unreliable clustering
try a smaller initial number of clusters
Warning: Removed a singular subsignature; number 1; -1 remain

Error: unreliable clustering
try a smaller initial number of clusters
Subclasses = 0; Rissanen = 0.000000;  Solution: Number of subclasses is 0
Clustering class 2, with 16027 pixels
ERROR: Not enough data points!
GRASS6.1.cvs(klasifikace_krkonos):~>

What does it meen, "Not enough data points"? What should I do?

Thanks a lot

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