Hello!

I am doing an ENFA-MADIFA analysis and I have to do the computation of 
the Mahalanobis distances with the command below:

ma286<-mahasuhab(map286, pres286)

but I receive this error:

Error in solve.default(cov, ...) : Lapack routine dgesv: system is 
exactly singular


(map286 is a SpatialPixelDataFrame and pres286 is a SpatialPoints).

What does it mean?

Can anyone help me?

Thank you in advance.
bye,

Michela

*****************************************************************
Dr. Michela Giusti
ISPRA
Istituto Superiore per la Protezione e la Ricerca Ambientale
Via Brancati, 60
00144 Roma
Tel. +390650074746
michela.giusti@isprambiente.it
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