Re: [eigen] Module for orth. Polynomials |

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*To*: "eigen@xxxxxxxxxxxxxxxxxxx" <eigen@xxxxxxxxxxxxxxxxxxx>*Subject*: Re: [eigen] Module for orth. Polynomials*From*: Pavel Holoborodko <pavel@xxxxxxxxxxxxxxx>*Date*: Mon, 25 Aug 2014 17:38:46 +0900

This module would be of high value indeed.

Especially in combination with multi-precision support.

Then Eigen would have full spectrum of classic numerical integration methods (and in arbitrary precision!).

(As far as I know, adaptive Guass-Kronrod is being developed as another module for Eigen as well)

Pavel.

On Mon, Aug 25, 2014 at 5:19 PM, Manuel Yguel <manuel.yguel@xxxxxxxxx> wrote:

Great !

I think it is a nice thing to have, I am interested to take a look at it.

Dr. Ing. Manuel Yguel

Porteur du projet StraTagGem

36, rue de l'Université

67000, Strasbourg.

FRANCE

Tel: +33 9 73 52 86 75

Mobile: +33 6 59 59 17 30

On 08/25/2014 10:16 AM, Roman Pascal Schärer wrote:

Dear Eigen developers and users,

we developed a small C++ package for the computation of orthogonal polynomials (OPQ++) as an unsupported module inside Eigen for our own needs.

The main goal of this package is to provide methods to compute an orthogonal set of polynomials for a given weight function. This has been realised with the modified Chebyshev algorithm, which computes the recurrence coefficients of the polynomials. This algorithm makes use of the moments of the weight function, which in general need to be computed using some numerical integration method. For now we provide our own implementations of quadrature formulas (e.q. Gaussian quadratures). With the obtained recurrence coefficients the nodes and weights of a Gaussian quadrature formula for the weight function can be easily computed using e.g. the Golub-Welsch algorithm.

Since this package could be easily integrated in the Eigen library, I’d like to ask if there is interest for such a module to be made public. Since it is a rather small module, it could e.g. also be integrated in the “Polynomials Module”.

If such interest exists, we would be open for suggestions regarding the API and the implementation of more features such as multi-precision floating point number support etc.

Best,

Roman

**Follow-Ups**:**Re: [eigen] Module for orth. Polynomials***From:*"Claas H. Köhler"

**References**:**[eigen] Module for orth. Polynomials***From:*Roman Pascal Schärer

**Re: [eigen] Module for orth. Polynomials***From:*Manuel Yguel

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