April 2014 - GiNaC-devel

04 Jun '15

Hi, is there any reason not to define the derivative of the built-in abs() function as either abs(x)/x or csgn(x) ? Currently it has not derivative defined at all. Regards, Jan

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Bug fix G_do_hoelder
by Stefan Weinzierl 12 Apr '14

12 Apr '14

Dear all, attached is a small bug fix for the method G_do_hoelder in the file inifcns_nstsums.cpp The method G_do_hoelder transforms the arguments as z --> 1-z. If z has an imaginary part, the sign of the imagniary part transforms as s --> -s. In the special case where z is real and >1, the transformed value is real and <0. For (transformed) real negative values of z the sign of the imaginary part is not relevant (there are no branch cuts). The code requires that in this case the sign takes the default value +1. This is now fixed. Best wishes, Stefan

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[SCM] GiNaC -- a C++ library for symbolic computations branch, master, updated. release_1-4-0-424-gd023220
by git＠ginac.de 12 Apr '14

12 Apr '14

This is an automated email from the git hooks/post-receive script. It was generated because a ref change was pushed to the repository containing the project "GiNaC -- a C++ library for symbolic computations". The branch, master has been updated via d023220cece92637c3e55051f127650f2131de44 (commit) from 97ef604e3da2e918cad6cb10af61f7d07999ed97 (commit) Those revisions listed above that are new to this repository have not appeared on any other notification email; so we list those revisions in full, below. - Log ----------------------------------------------------------------- commit d023220cece92637c3e55051f127650f2131de44 Author: Stefan Weinzierl <stefanw(a)thep.physik.uni-mainz.de> Date: Sat Apr 12 14:32:20 2014 +0300 G_do_hoelder: fix the transformation of the imaginary part. The G_do_hoelder function transforms the arguments as z -> 1-z. If z has an imaginary part, the sign of the imagniary part transforms as s -> -s. In the special case where z is real and > 1, the transformed value is real and < 0. For (transformed) real negative values of z the sign of the imaginary part is not relevant (there are no branch cuts). The code requires that in this case the sign takes the default value +1. This is now fixed. ----------------------------------------------------------------------- Summary of changes: ginac/inifcns_nstdsums.cpp | 5 ++--- 1 files changed, 2 insertions(+), 3 deletions(-) hooks/post-receive -- GiNaC -- a C++ library for symbolic computations

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