eigen2

Contents: Description, Arguments, Usage, Examples, Sub-Functions, Related Functions, Source Supported Under Version: >1.00 Current .dvrc Version: 1.02 Description Compute eigenvalues and vectors from a set of spectra Arguments and Return Values Arguments: A numeric array and a number of components Return Value: A structure containing .evecs, .evals, .avg, and .C. where evecs are the eigen vectors, evals are the eigen values, avg is the band average and C is the covariance matrix. Usage Syntax: eigen2(object, number of vectors, iterations) 'object' - can be any set of vectors or arrays 'number of vectors' - is the desired number of eigen vectors to be calculated 'iterations' - is an optional number of iterations Examples dv> a 577x1852x10 array of float, bsq format [42,744,160 bytes] where a is emissivity data but this does not have to be the case dv> e=eigen2(a[::20,::100],10) EV# Iterat. Eigenvalue ---+--------+----------- 1 200 318.930796 2 19 1.558902 3 14 0.551241 4 18 0.095099 5 17 0.037189 6 75 0.016159 7 200 0.014348 8 29 0.013861 9 54 0.009416 10 5 0.008374 struct, 4 elements evecs: 10x10x1 array of double, bsq format [800 bytes] evals: 10x1x1 array of float, bsq format [40 bytes] avg: 10x1x1 array of double, bsq format [80 bytes] C: 304x10x1 array of float, bsq format [12,160 bytes]

DavinciWiki Mini-Nav Bar Contents Functions Function Categories Common Procedures Glossary Download Davinci Change Log News Mailing List Contact Developers davinci-dev [AT] mars.asu.edu All other topics See navigation on the left Major Sub-Functions mxm translate Related Functions eigen pca pca2 general_science.dvrc eigen2() Recent Library Changes Change Log Created On: 02-15-2006 Modified On: 01-17-2008