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## Re: [Bug-gsl] [PATCH] a one-pass run algorithm for sigma (histograms)

**From**: |
Brian Gough |

**Subject**: |
Re: [Bug-gsl] [PATCH] a one-pass run algorithm for sigma (histograms) |

**Date**: |
Tue, 01 Dec 2009 14:07:08 +0000 |

**User-agent**: |
Wanderlust/2.14.0 (Africa) Emacs/22.2 Mule/5.0 (SAKAKI) |

At Sat, 28 Nov 2009 07:57:49 +1300,
Johannes Buchner wrote:
>* I looked into the algorithm in the mentioned reference.*
>* However, the formula 1.6b, for n values at x_k, boils down to *
>* \sum_(1+k)^(n+k){1/l}. This can be calculated if there is a discrete*
>* weight (n values at x_k). I was unable to find a shorthand formula for*
>* this sum (so it can be generalized from n to a continuous value).*
>* Thus I conclude that it is not possible to use the mentioned algorithm*
>* for continuous histogram weights.*
Ok, thanks for looking into it. Since the current algorithm is
working ok I will leave it alone, as the speed is not a major issue.
--
Brian Gough
GNU Scientific Library -
http://www.gnu.org/software/gsl/

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**Re: [Bug-gsl] [PATCH] a one-pass run algorithm for sigma (histograms)**,
*Brian Gough* **<=**