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From Luc Maisonobe <>
Subject Re: [MATH] Eigen decomposition of matrices consisting of RealFieldElements
Date Fri, 20 Dec 2013 09:22:29 GMT
Hi all,

Le 19/12/2013 20:52, Ted Dunning a écrit :
> I had the same question.
> Presumably, it is a reasonable thing to have in the corner case of needing
> eigenvalues for matrices with extended precision decimal numbers or some
> such, but I would be very surprised if there measurably non-zero demand for
> such a feature.
> On Thu, Dec 19, 2013 at 9:55 AM, Martin Grotle Soukup <
>> wrote:
>> Hi,
>> Apologies for being impatient, but does someone think this is a good idea?

I think it is a good idea. In fact, I even think most of our algorithms
would be interesting to provided both with primitive doubles and with
RealFieldElements. I dream of a way to automatically convert from one
implementation to the other (Apache Commons Nabla is a step in this
direction, for DerivativeStructure only but it would be worth
generalizing it).

As Gilles often say, we are short of manpower, so we don't do this as a
general move. Ted's remark above is one of our decision driver: if there
is demand for it, it is worth doing it. So to sum up, the decision is a
case by case basis.

Going back to this specific case, I guess that if you propose to help on
this, you have your own use case. Then I would suggest to go for it. You
could open a JIRA issue for it, try to do the implementation and attach
your code to the issue so we pick it up there, review it, and include it
in the library.

best regards,

>> In case of the contrary I will not trouble this mailing list with this
>> request any further.
>> Best regards,
>> Martin Grotle Soukup
>> 2013/12/13 Martin Grotle Soukup <>
>>> Hi,
>>> The linear-package in commons-math contains a class that does an eigen
>>> value decomposition of a RealMatrix. Would there be of interest to add a
>>> similar class doing eigen value decomposition of a matrix consisting of
>>> RealFieldElements?
>>> I am happy to help if this is the case.
>>> Best regards,
>>> Martin Grotle Soukup

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