brent's method and numerical derivatives

[cb]

Dear all,

is someone aware of freely available and easy to plug in (OGS5)
implementations of

- Brent's method
(http://www.aip.de/groups/soe/local/numres/bookcpdf/c9-3.pdf)

- numerical approximation of derivatives
(http://www.it.uom.gr/teaching/linearalgebra/NumericalRecipiesInC/c5-7.pdf)

Best, Christof

--
_______________________________________
Dr. Christof Beyer
Institute of Geosciences
Geohydromodelling
Christian-Albrechts-University Kiel
Ludewig-Meyn-Str. 10
24118 Kiel
Germany

phone: +49(0)431-8803172
fax: +49(0)431-8807606
mobile: +49(0)176-24297908
email: christo...@gpi.uni-kiel.de
home: www.uni-kiel.de/ghm
_______________________________________

[Joshua Taron]

Christof,

Norbert put one in (brent) when he did the helmholtz equations of state. On the road now and can't remember exactly where it is, but can look later. It's in there, with the eos, probably called zbrent.

Josh

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[Lars Bilke]

Hi Christoph,

you can find Brent’s method in ThirdParty/Brent:

https://github.com/ufz/ogs5/tree/master/ThirdParty/Brent 

Best,
Lars

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[Singh Ashok]

void NsPol3 (double p, double q, double r, vector<double>* roots)

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[cb]

Thanks guys!

eos zbrent is the same as  gcc zbrent and is based on Numerical Recipes. This is the functio I want to replace.

I'll try Lars and Ashoks suggestions.

Christof

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-- 
_______________________________________
Dr. Christof Beyer
Institute of Geosciences
Geohydromodelling
Christian-Albrechts-University Kiel
Ludewig-Meyn-Str. 10
24118 Kiel
Germany

phone:  +49(0)431-8803172