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Message-ID: <415F6A8C.4010405@kimvdlinde.com>
Date: Sat, 02 Oct 2004 22:57:16 -0400
From: Kim van der Linde <kim@kimvdlinde.com>
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To: Jakarta Commons Developers List <commons-dev@jakarta.apache.org>
Subject: [math] Matrix subMatrix and mean methods
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Hi Phil,

I have been thinking for a few days on the Matrix classes.

I think the Matrix class itself should contain all those methods that do 
matrix calculations (add, subtract, multiply) that either a Matrix 
themselfs or proporties of the Matrix (isSingular for example). The mean 
methods (getRowMeans) etc are statistics done ON a matrix, and I think 
they should be in a seperate class, maybe called MatrixStats. This 
enables aso he option to add variances and SD's which are needed for 
column mean resp mean-SD standardizations, to be used for example in PCA 
calculations when a covariance resp. correlation matrix is used.

Is there the intention to add an EigenvalueDecomposition class to the 
package? In that case, which algorithm is targeted to be used? Jacobi?

Cheers,

Kim
-- 
http://www.kimvdlinde.com

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