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## Re: [Help-gsl] Semantics of gsl_siman_metric_t

**From**: |
Marco Maggi |

**Subject**: |
Re: [Help-gsl] Semantics of gsl_siman_metric_t |

**Date**: |
Wed, 22 Dec 2010 22:35:44 +0100 |

"Marco Maggi" write:
>*"Saqib Ilyas" wrote:*
>*> The documentation says that the GSL Simulated Annealing*
>*> function gsl_siman_metric_t(void *xp, void *yp), should*
>*> return the distance between two configurations xp and*
>*> yp. Semantically, should it be, x - y or y - x?*
>
>* Probably it was meant to be "x-y",*
If you interpret it in strict math terms, it does not matter
of course: "distance" means that d(x, y) = d(y, x). Since
it is not used in GSL's siman, nobody knows.
--
Marco Maggi