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* Proposal For New Numerical Differentiation Function
@ 2019-09-09 23:44 Bob Smith
  2019-09-11  1:05 ` Patrick Alken
  0 siblings, 1 reply; 3+ messages in thread
From: Bob Smith @ 2019-09-09 23:44 UTC (permalink / raw)
  To: GSL Discuss

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

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2019-09-09 23:44 Proposal For New Numerical Differentiation Function Bob Smith
2019-09-11  1:05 ` Patrick Alken
2019-09-11 12:25   ` Bob Smith

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