Hello, 17.06.2020, 21:54, "Richard B. Kreckel via GiNaC-devel" <ginac-devel@ginac.de>:
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- Log ----------------------------------------------------------------- commit fa1ffcfdc9da97a6fb7cc2c9c36fe1fc45c808a9 Author: Pierangelo Masarati <pierangelo.masarati@polimi.it> Date: Wed Jun 17 19:52:49 2020 +0200
Improve diff(abs(x)) for real x.
I think this patch is wrong and should be reverted. diff(abs(x)) does not exist at x -> 0. Alternatively one can modify the definition of numeric::step() function [1] so it throws an exception when being evaluated at 0. [1] https://www.ginac.de/ginac.git/?p=ginac.git;a=blob;f=ginac/numeric.cpp;hb=HE... There's no way to "patch" math. Best regards, Alexey