From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 79432 invoked by alias); 9 Sep 2019 23:44:55 -0000 Mailing-List: contact gsl-discuss-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gsl-discuss-owner@sourceware.org Received: (qmail 79418 invoked by uid 89); 9 Sep 2019 23:44:55 -0000 Authentication-Results: sourceware.org; auth=none X-Spam-SWARE-Status: No, score=-0.0 required=5.0 tests=AWL,BAYES_00,KAM_SHORT,RCVD_IN_DNSWL_LOW,SPF_SOFTFAIL,UNSUBSCRIBE_BODY autolearn=no version=3.3.1 spammy=whom, 2003, HTo:U*gsl-discuss, finite X-HELO: resqmta-ch2-04v.sys.comcast.net Received: from resqmta-ch2-04v.sys.comcast.net (HELO resqmta-ch2-04v.sys.comcast.net) (69.252.207.36) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Mon, 09 Sep 2019 23:44:53 +0000 Received: from resomta-ch2-09v.sys.comcast.net ([69.252.207.105]) by resqmta-ch2-04v.sys.comcast.net with ESMTP id 7Kz7i0NJ3JJ9E7TL0ifhky; Mon, 09 Sep 2019 23:44:50 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=comcastmailservice.net; s=20180828_2048; t=1568072690; bh=wrgoUnTy+rYwsSnn/JsOmMWYxnccxky8rxCdHuUn7f4=; h=Received:Received:To:From:Subject:Message-ID:Date:MIME-Version: Content-Type; b=G535MZxnBV7MkaWdA8RAqpN+GqXj2MOrU2/OyTVsDT0rcgbYHvYQJuZzb2Af8TZ+Y yWNIJeaaPkLQWLUMX4jwuy7OFgQ4tbRn9VYk8lvPm8mgV4sqNFJOuQMx99PTYsvg7/ 900N4M8mnag6jFHzombS45QVinnImP+FfZwxSe0qLKSMpRP5syAzYcNYN0JHUgIYtS qnwkNMt4fbPyScvQcN0SfBQLJKgc8l0lJhOwd2Zc1nN89x5havfDAThXerYDbjRTGE tqkX4giANugHy28yGU3q18tHk9m89aM+7M4OFRZGazNTYmXJnyNhNOySZ3+SwWUjPV QA2pPqPKk+HdQ== Received: from [192.168.0.113] ([73.201.76.51]) by resomta-ch2-09v.sys.comcast.net with ESMTPSA id 7TKziKTjrsv0O7TL0ifLHe; Mon, 09 Sep 2019 23:44:50 +0000 X-Xfinity-VAAS: gggruggvucftvghtrhhoucdtuddrgeduvddrudekjedgvddvucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuvehomhgtrghsthdqtfgvshhipdfqfgfvpdfpqffurfetoffkrfenuceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujfgurhepvffhuffkffgfgggtgfesthekredttdefjeenucfhrhhomhepuehosgcuufhmihhthhcuoegsshhmihhthhesshhuughlvgihphhlrggtvgdrtghomheqnecuffhomhgrihhnpehnrghrshdvtddttddrohhrghdpghhnuhdrohhrghdpshhuughlvgihphhlrggtvgdrtghomhenucfkphepjeefrddvtddurdejiedrhedunecurfgrrhgrmhephhgvlhhopegludelvddrudeikedrtddruddufegnpdhinhgvthepjeefrddvtddurdejiedrhedupdhmrghilhhfrhhomhepsghsmhhithhhsehsuhgulhgvhihplhgrtggvrdgtohhmpdhrtghpthhtohepghhslhdqughishgtuhhsshesshhouhhrtggvfigrrhgvrdhorhhgnecuvehluhhsthgvrhfuihiivgeptd X-Xfinity-VMeta: sc=-100;st=legit To: GSL Discuss From: Bob Smith Subject: Proposal For New Numerical Differentiation Function Message-ID: Date: Mon, 09 Sep 2019 23:44:00 -0000 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit X-SW-Source: 2019-q3/txt/msg00001.txt.bz2 I have written a function for GSL to perform Numerical Differentiation which I would like to offer to this project. I saw on https://www.gnu.org/software/gsl/ that I should first propose it as an extension, however the "How to help" link under Extensions/Applications goes nowhere, so I wondered if there was somewhere else to look for guidelines on setting up an extension. I looked over most of the links to the listed extensions (many of which are broken) and didn't see any commonality which may be the answer to my question. In any case, to whom do I write to get added to the list of extensions? Thanks for your help. FWIW, the new function is more accurate (up to 13 or 14 significant digits vs. 9 or 10 for ) and can compute Nth derivatives by passing N (1 through 9) to the function at zero additional cost in performance. The algorithm is based upon the papers “New Finite Difference Formulas for Numerical Differentiation”, I.R. Khan, R. Ohba / Journal of Computational and Applied Mathematics 126 (2000) pp. 269-276 “Taylor Series Based Finite Difference Approximations of Higher-Degree Derivatives”, I.R. Khan, R. Ohba / Journal of Computational and Applied Mathematics 154 (2003) pp. 115-124 -- _______________________________________________________________ Bob Smith - bsmith@sudleyplace.com http://www.sudleyplace.com - http://www.nars2000.org