public inbox for gsl-discuss@sourceware.org
 help / color / mirror / Atom feed
From: Bob Smith <bsmith@sudleyplace.com>
To: GSL Discuss <gsl-discuss@sourceware.org>
Subject: Proposal For New Numerical Differentiation Function
Date: Mon, 09 Sep 2019 23:44:00 -0000	[thread overview]
Message-ID: <ac9d243e-f72c-f1e0-8251-d346bc84a6f8@sudleyplace.com> (raw)

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 <gsl_deriv_central>) 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

             reply	other threads:[~2019-09-09 23:44 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-09 23:44 Bob Smith [this message]
2019-09-11  1:05 ` Patrick Alken
2019-09-11 12:25   ` Bob Smith

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=ac9d243e-f72c-f1e0-8251-d346bc84a6f8@sudleyplace.com \
    --to=bsmith@sudleyplace.com \
    --cc=gsl-discuss@sourceware.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).