motoyang/graphest

A faithful graphing calculator

Graphest

Graphest is a graphing calculator that can faithfully plot arbitrary mathematical relations.

Getting Started

Download the app (available for both macOS and Windows), and try plotting some of the example relations.

Features

• Plot arbitrary equations/inequalities
• Never gives an incorrect result; if you find any relation plotted incorrectly, please report it here
• Cartesian and polar coordinates
• Parametric relations
• Full interactivity
• Extensive set of mathematical functions

Building from Source

Algorithm

Graphest aims to provide a modern, open-source and extensible alternative to GrafEq™ [Ped].

The following algorithms in [Tup01] are implemented: 1.1–3.2, 3.3 (partially), 3.4.1–3.4.3, 3.4.5 (partially).

• [Ped] Pedagoguery Software Inc. GrafEq™. http://www.peda.com/grafeq
• [Tup96] Jeffrey Allen Tupper. Graphing Equations with Generalized Interval Arithmetic. Master's thesis, University of Toronto, 1996. http://www.dgp.toronto.edu/~mooncake/thesis.pdf
• [Tup01] Jeff Tupper. Reliable Two-Dimensional Graphing Methods for Mathematical Formulae with Two Free Variables. SIGGRAPH 2001 Conference Proceedings, 2001. http://www.dgp.toronto.edu/~mooncake/papers/SIGGRAPH2001_Tupper.pdf