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November 2024

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[SCM] GiNaC -- a C++ library for symbolic computations branch master updated. release_1-4-0-779-g32702f84
by git service 26 Nov '24

26 Nov '24

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 32702f847fb49da649f4362b0de3084890ac8129 (commit) from 0aa0a0c6fe7d24fdc41af01581e8728054393740 (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 32702f847fb49da649f4362b0de3084890ac8129 Author: Richard Kreckel <kreckel(a)ginac.de> Date: Tue Nov 26 00:21:28 2024 +0100 Avoid "expression with side effects..." warning using ex_to<T>(). Clang++ warns that instantiations of this inline template function ex_to<T>(const ex &) are "expression with side effects [that] will be evaluated despite being used as an operand to 'typeid'". Let's declare this ex_to<T>() as a pure function (i.e. having no side effects) for compilers which support __attribute__((__pure__)). GCC seems to support this attribute since more than ten years. ----------------------------------------------------------------------- Summary of changes: ginac/compiler.h | 2 ++ ginac/ex.h | 3 ++- 2 files changed, 4 insertions(+), 1 deletion(-) hooks/post-receive -- GiNaC -- a C++ library for symbolic computations

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Find length of a vector
by Jan Rheinländer 02 Nov '24

02 Nov '24

Hi, trying to find the length of a vector by taking the square root of the scalar product, I get this (in ginsh): > v = [[a,b]]; [[a,b]] > r = sqrt(v * transpose(v)); sqrt([[a,b]]*[[a],[b]]) > evalm(r); matrix::pow(): don't know how to handle exponent The reason is that the scalar product evaluates to a matrix with a single element, not to a numeric. Is that intended? Thanks, Jan Rheinländer

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