Re: gsl

["George N. White III" <gnwiii@xxxxxxxxx>]

On Tue, Aug 9, 2022 at 10:23 AM Patrick Dupre <pdupre@xxxxxxx> wrote:

Hello,

I get an error
gsl: qag.c:247: ERROR: roundoff error prevents tolerance from being achieve
Then, I tried to see where is this file
qag.c

Unfortunately
dnf repoquery --whatprovides 'qag.c'

does not provide the information

qag.c is from a C translation of QUADPACK, a Fortran library for numerical integration.

The error is very unlikely to be a bug -- numerical quadrature routines often allow you

to specify the desired error tolerance of the result, and will issue an error if they are not able to

provide the required tolerance.

https://www.gnu.org/software/gsl/doc/html/integration.html has:

 

int gsl_integration_qag(const gsl_function *f, double a, double b, double epsabs, double epsrel, size_t limit, int key, gsl_integration_workspace *workspace, double *result, double *abserr)

This function applies an integration rule adaptively until an estimate of the integral of over is achieved within the desired absolute and relative error limits, epsabs and epsrel. The function returns the final approximation, result, and an estimate of the absolute error, abserr. The integration rule is determined by the value of key, which should be chosen from the following symbolic names,

--

George N. White III

_______________________________________________
users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx
To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx
Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/
List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines
List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx
Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue