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Developer(s) Bernard Parisse
Initial release 2000; 18 years ago (2000)
Stable release
1.4.9-45 / January 2018 (2018-01)
Repository Edit this at Wikidata
Written in C++
Operating system Windows, macOS, Linux
Type Computer algebra system
License GNU GPL
Website www-fourier.ujf-grenoble.fr/~parisse/giac.html

Xcas is a user interface to Giac, a free, basic Computer Algebra System (CAS) for Windows, macOS and Linux/Unix. Giac can be used directly inside software written in C++.

Xcas and Giac are open-source projects developed by Bernard Parisse's et al. at the Joseph Fourier University of Grenoble (Isère) since 2000. It is based on experiences gained with Parisse's former project Erable.

Giac has a compatibility mode with Maple and MuPAD and Qcas and ExpressionsinBar software and TI-89, TI-92 and Voyage 200 calculators. Users can use Giac/Xcas as well as a free software compatible with Maple to develop formal algorithms or use it in other software. Among other things Xcas can solve equation and draw graph. Xcas is working in offline mode.

Pocket CAS and CAS Calc P11 utilize Giac. In 2013, it was also integrated into GeoGebra's CAS view.

CmathOOoCAS, an OpenOffice.org plugin which allows formal calculation in Calc spreadsheet and Writer word processing, uses Xcas to perform calculations.

The system was also chosen by Hewlett-Packard as the CAS for their HP Prime calculator, which utilizes the Giac/Xcas 1.4.9 engine under a dual-license scheme.


Here is a brief overview of what Xcas is able to do:

  • computer algebra;
  • geometry in the plane;
  • geometry in space;
  • spreadsheet;
  • statistics;
  • programming.

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