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From Phil Steitz <>
Subject Re: [math] commons.math extension
Date Thu, 02 Sep 2004 01:52:45 GMT

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and make sure to include a copy of the License and NOTICE.txt in anything 
that you distribute.  Also, if you are modifying APIs or functionality of 
classes in commons-math, while the license requires only that you provide 
a notice that you have changed the files, it is best to rename and/or 
repackage files that have been significantly modified.

We welcome your contributions to commons-math and hope that you will 
submit design ideas and patches implementing your extensions.


Kim van der Linde wrote:
> For the people who are interested in some extensions to the commons.math 
> package such as "0-based" Matrix class and population variances 
> implemented within the variances class can look here:
> or download the jar file:
> Additionally I have added two classes. The first is called Distances
> with matrix based euclidian and mahalanobis distance calculations. The
> second is called SpecialMatrices and contains shortcuts for SSCP,
> covariance and correlation matrices, as well as difference by row/column
> means calculations. Both the correlation as well as he covariance 
> matrices can be estimated using either sample or population variances.
> I hope to add in the coming weeks the RMA (Reduced Major Axis)
> implementation within the SimpleRegression and the MVE (Minimum Volume
> Elipsoid) to the package, of which the last one is the main reason for
> my disagreement on the matrix indexing.
> So, no objections to relasing RC1.
> Kim
> Phil Steitz wrote:
>> I have made the following changes and updated the release candidate here
>> <>, as well as 
>> the web site <>:
>> 1) Changed the name of BivariateRegression to SimpleRegression
>> 2) Added notes in Variance, StatUtils and StandardDeviation javadoc 
>> making assumptions about precomputed mean explicit
>> 3) Made standard matrix element indexing convention explicit in 
>> RealMatrix, BigMatrix.
>> 4) Incorporated Mark's improvement of developer.xml
>> If there are no objections, I will send a formal announcement of the 
>> RC availablity tomorrow.
>> Phil
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