*Proposal For New Numerical Differentiation Function@ 2019-09-09 23:44 Bob Smith2019-09-11 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 â€œNew Finite Difference Formulas for Numerical Differentiationâ€, I.R. Khan, R. Ohba / Journal of Computational and Applied Mathematics 126 (2000) pp. 269-276 â€œTaylor Series Based Finite Difference Approximations of Higher-Degree Derivativesâ€, 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 ^ permalink raw reply [flat|nested] 3+ messages in thread

*Re: Proposal For New Numerical Differentiation Function2019-09-09 23:44 Proposal For New Numerical Differentiation Function Bob Smith@ 2019-09-11 1:05 ` Patrick Alken2019-09-11 12:25 ` Bob Smith 0 siblings, 1 reply; 3+ messages in thread From: Patrick Alken @ 2019-09-11 1:05 UTC (permalink / raw) To: gsl-discuss Hello, Yes the extensions may be a bit out of date, sorry about that.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. 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 <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 > ^ permalink raw reply [flat|nested] 3+ messages in thread

*2019-09-11 1:05 ` Patrick AlkenRe: Proposal For New Numerical Differentiation Function@ 2019-09-11 12:25 ` Bob Smith0 siblings, 0 replies; 3+ messages in thread From: Bob Smith @ 2019-09-11 12:25 UTC (permalink / raw) To: gsl-discuss On 9/10/2019 9:05 PM, Patrick Alken wrote: > Hello, > > Â 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.Â 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.Â The algorithm is based upon the papers >> >> â€œNew Finite Difference Formulas for Numerical Differentiationâ€, I.R. >> Khan, R. Ohba / Journal of Computational and Applied Mathematics 126 >> (2000) pp. 269-276 >> >> â€œTaylor Series Based Finite Difference Approximations of Higher-Degree >> Derivativesâ€, 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 ^ permalink raw reply [flat|nested] 3+ messages in thread

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