October 2003 - GiNaC-list

differential operators
by Kai Ludwig 29 Feb '04

29 Feb '04

Hi All, I'm new to GiNac. Is there a way to execute symbolic differentiation of expressions that includes differential operators ? e.g. suppose an expression ex F = u * dx*u When differentiate that expression F.diff(u) it should result in the expression dx*u - u*dx Regards Kai -- http://echempp.sourceforge.net Kai Ludwig Universität Tübingen Institut für Organische Chemie Auf der Morgenstelle 18 D-72076 Tübingen Tel.: 07071/29-73049 Mail: kai.ludwig(a)uni-tuebingen.de

4 10

Interval Arithmetic in GiNaC
by C T L O'Dwyer 20 Oct '03

20 Oct '03

I was wondering if GiNaC has support for interval arithmetic, and if not, then how to add it (would it just be a new numeric type with it's own rules?) or are there any other packages out there that can be combined with GiNaC? I need symbolic manipulation for my project, but I also need to be able to check very quickly if a given value exists in an interval. THx, Carl O'Dwyer cs1ctlo(a)bath.ac.uk

2 1

Announcing GiNaC 1.1.4
by Richard B. Kreckel 17 Oct '03

17 Oct '03

* It has defied the world's greatest mathematicians. * It lies in wait wherever problems gather. * It is a timeless force with the power to change the course of history. Dear software aficionado, It is our pleasure to introduce GiNaC release 1.1.4. For the true software collecting enthusiast, this is a release like no other -- explaining, illuminating, and illustrating in depth how the bits, bytes and exabytes of the computing machinery more often than not solve problems of undreamed complexity. GiNaC 1.1.4 -- an opus like no other available today -- will bring you to the crossroads of mathematics and computing. Quite simply, GiNaC-1.1.4 is an unparalleled resource no serious software connoisseur can afford to overlook. Take advantage of this singular opportunity and download your very own copy today from URL <ftp://ftpthep.physik.uni-mainz.de/pub/GiNaC>. Best regards -rbk. -- Richard B. Kreckel <Richard.Kreckel(a)GiNaC.DE> <http://www.ginac.de/~kreckel/>

1 0

ex to double
by Volker Vogel 15 Oct '03

15 Oct '03

Hi, I am a new user to ginac, and i am trying to find out how to convert an ex to a double. This of course only makes sense when ex contains something that is a double. I have been searching the tutorial and tried "expresion output". There it explains in section 5.12.1 how to manipulate the outputstream with "csrc" but I can not get the examples working. I also dont know if this is the right way get my double. #include <iostream> #include <stdio.h> #include <ginac/ginac.h> using namespace std; using namespace GiNaC; int main(){ ex poly=2.7; double val; std::ostream & csrc(std::ostream & os); cout << csrc <<poly <<"\n"; return 0; } When I run the example above I get the error below, and I don not know how to handle it. /tmp/cczNv1jd.o: In function `main': /tmp/cczNv1jd.o(.text+0x36): undefined reference to `csrc(ostream &)' collect2: ld returned 1 exit status I am working wih ginac version : 1.1.1 g++: 2.95.3 I am not that much intro programming to understand how stream manipulation really works and to understand the ginac source code. Can anyone help me to get my double ?? Saludos de España, Volker ______________________________________________________________________________ Horoskop, Comics, VIPs, Wetter, Sport und Lotto im WEB.DE Screensaver1.2 Kostenlos downloaden: http://screensaver.web.de/?mc=021110

2 1

<no subject>
by Volker Vogel 15 Oct '03

15 Oct '03

ginac-list bananabird(a)web.de ______________________________________________________________________________ Horoskop, Comics, VIPs, Wetter, Sport und Lotto im WEB.DE Screensaver1.2 Kostenlos downloaden: http://screensaver.web.de/?mc=021110

1 0