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Wojtek, You could try the following: Davis 1985 'Statistics and Data Analysis in Geology' 2nd Ed. Wiley & Sons (this ref is from memory so somebody please correct if it's wrong). This provides a good step by step introduction to eigenvectors and eigenvalues. Unfortunately you can't escape the maths (which are mainly matrix manipulations) if you want to understand the technique. For more practical applications of the method then check out the following refs: Woodcock, N. H. 1977. Specification of fabric shapes using the eigenvalue method. Geological Society of America Bulletin. V. 88, p1231-1236. Woodcock, N. H. and Naylor M.A. 1983. Randomness testing in three-dimensional orientation data. Journal of Structural Geology V.5, No.5, p539-548. (tpc x2) If you want to know about eigenvectors/values for fabric shape analysis then there are also a number of stereonet plotting packages that include eigenvector and eigenvalue calculations (e.g StereoPro http://freespace.virgin.net/martin.walters/index.html amongst others). Cheers Tim ----------------------------- Tim Wynn Structural Geologist GeoScience Ltd Falmouth Business Park Falmouth Cornwall TR11 4SZ U.K. Tel: 44 (0)1326 211070 Fax: 44 (0)1326 212754 e-mail: [log in to unmask] web: www.geoscience.co.uk ----------------------------- > -----Original Message----- > From: [log in to unmask] > [mailto:[log in to unmask]]On Behalf Of Wojciech > Czaplinski > Sent: 18 February 2000 08:11 > To: geo-tectonics > Subject: eigenvalues and eigenvectors > > > Hello All, > Can anyone explain to me (or give some references explaining) what the > hell are eigenvalues and eigenvectors ??? Bear in mind, that my maths > neurons got severely damaged by a heavy case of boreliosis ;) > > thanks in advance - Wojtek > %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%