From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 114548 invoked by alias); 11 Sep 2019 12:25:06 -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 114531 invoked by uid 89); 11 Sep 2019 12:25:06 -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=ir, Proposal, finite, Finite X-HELO: resqmta-ch2-03v.sys.comcast.net Received: from resqmta-ch2-03v.sys.comcast.net (HELO resqmta-ch2-03v.sys.comcast.net) (69.252.207.35) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Wed, 11 Sep 2019 12:25:04 +0000 Received: from resomta-ch2-01v.sys.comcast.net ([69.252.207.97]) by resqmta-ch2-03v.sys.comcast.net with ESMTP id 80bCi3A1a6Uh781gCiSYZV; Wed, 11 Sep 2019 12:25:00 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=comcastmailservice.net; s=20180828_2048; t=1568204700; bh=xGSqjsYQ5MDKrTGTalG+e36xCITjHM3pmCO+8sT7KXc=; h=Received:Received:Subject:To:From:Message-ID:Date:MIME-Version: Content-Type; b=BPiEOn0HM84QK2g/ZIuEIEQR8gUIQBCxeBNe7kJJDpodp00yuKOrgz90tgMQ8YrFT NmQa6uuNPbSRX/y1CymmijgkHihorlvcRfbKR2QyjllBmrxIgxBx0gvraYMP1Nf87k NgmFjBCU4T0zy1Qq4CVmaFAEjjId9omrjqPwGXqr+8tYQFqFWluN6UT7QIoAgYSZ2V q67mp0bRyBGhdsnnYh6YT1dueLPWnan+eBjChaiCxdMH+CGmOVqu0cG5ehWsK0aQzm AngSCp4zAtotqMU7visb4wprf6hrfRNBOJOzANa21zImLQ9CguRlzUnft+iPW44rT0 qmlRRP5Bjkw7w== Received: from [192.168.0.113] ([73.201.76.51]) by resomta-ch2-01v.sys.comcast.net with ESMTPSA id 81gBiduSpKYFn81gCiOOQm; Wed, 11 Sep 2019 12:25:00 +0000 X-Xfinity-VAAS: gggruggvucftvghtrhhoucdtuddrgedufedrtdefgddvhecutefuodetggdotefrodftvfcurfhrohhfihhlvgemucevohhmtggrshhtqdftvghsihdpqfgfvfdppffquffrtefokffrnecuuegrihhlohhuthemuceftddtnecunecujfgurhepuffvfhfhkffffgggjggtgfesthekredttdefjeenucfhrhhomhepuehosgcuufhmihhthhcuoegsshhmihhthhesshhuughlvgihphhlrggtvgdrtghomheqnecuffhomhgrihhnpehnrghrshdvtddttddrohhrghdpghhnuhdrohhrghdpshhuughlvgihphhlrggtvgdrtghomhenucfkphepjeefrddvtddurdejiedrhedunecurfgrrhgrmhephhgvlhhopegludelvddrudeikedrtddruddufegnpdhinhgvthepjeefrddvtddurdejiedrhedupdhmrghilhhfrhhomhepsghsmhhithhhsehsuhgulhgvhihplhgrtggvrdgtohhmpdhrtghpthhtohepghhslhdqughishgtuhhsshesshhouhhrtggvfigrrhgvrdhorhhgnecuvehluhhsthgvrhfuihiivgeptd X-Xfinity-VMeta: sc=0;st=legit Subject: Re: Proposal For New Numerical Differentiation Function To: gsl-discuss@sourceware.org References: <97266350-d80c-b675-e02d-870977e8a513@colorado.edu> From: Bob Smith Message-ID: Date: Wed, 11 Sep 2019 12:25:00 -0000 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <97266350-d80c-b675-e02d-870977e8a513@colorado.edu> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit X-SW-Source: 2019-q3/txt/msg00003.txt.bz2 On 9/10/2019 9:05 PM, Patrick Alken wrote: > Hello, > >   Yes the extensions may be a bit out of date, sorry about that. Could > you make a git diff against the latest master branch of the git > repository, and then email me the diff? Then I can take a look and/or > help make an extension out of it. Thanks for you kind offer. I'll get back to you when I get git sorted. > Patrick > > On 9/9/19 5:44 PM, Bob Smith wrote: >> 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