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Open-GraphEq is a robust graphing application for mathematical formulae with 2 variables.

It is an open source alternative to the shareware GrafEq.

Both GrafEq and Open-GraphEq are based on the methods described in Reliable Two-Dimensional Graphing Methods for Mathematical Formulae with Two Free Variables by Jeff Tupper of University of Toronto, SIGGRAPH 2001.

The screenshot shows Open-GraphEq displaying a finished graph of y < 1/x. There is also a demo screencast.

Legend:

• White areas – no solutions
• Black areas – proven solutions
• Purples lines – progressively-refined grid used in the calculation

• Graphing engine based on interval arithmetic
• Toggleable grid display
• Optional domain tracking
• Care has been taken to produce accurate results

• Optional subpixel refinement
• Optional continuity tracking
• Formula editor
• Verify floating point accuracy

Open-GraphEq uses Shake. Other than that, its sole dependency is rolmodl. In addition to the system-defined lib and include paths, the build system looks for the rolmodl shared library in ./lib/rolmodl/, and for the rolmodl header files (./src/rolmodl/hpp/*) in ./lib/rolmodl/hpp.

After installing the dependencies, simply run ./build.sh from the project folder.

Use ./run.sh to run the application once built.

Use the mouse to select a region and dump the intervals it describes to stdout.