Grass/Erdas PCA

[Anantha Prasad]

Hi Grass/Erdas Users:
Is anybody in this group aware of the fact that the covariance matrix calculated by r.covar (and hence the eigenvalues/vectors and Principal Components calculated by Grass) is quite different from the results obtained by using PRINCE in Erdas? (When it is run on identical sets of maps). What could be the reason for this? Is there some bug? I have tried with different options but still the problem remains. Thanks. Prasad (prasad at ghat.inhs.uiuc.edu  Ph: 217-244-2166)