All integrable Hamiltonian systems are alike, while each nonintegrable one is nonintegrable in its own way
vfplot
A program for plotting two-dimensional vector fields.
- Large arrows
- The idea of vfplot is to plot vector fields with relatively large arrows — large enough to be perceived individually
- Curvy
- For large arrows to accurately represent the field they need to follow it in their shape; vfplot uses simple circular arcs
- Placed apart
- Placement of large arrows on a regular grid would limit the dynamic range possible; vfplot places the arrows via a packing of their bounding ellipses
- Field input
- Fields can be specified by data in a number of formats: a simple ASCII grid format, Matlab binary files, Gerris gfs files, or a pair of GMT grd files. Several test fields are built in and adding another is straightforward if you have a little C experience
- Vector output
- Output is in the PostScript and POV-Ray formats. The files are small, typically a few tens of kilobytes
- Limited in scope
- The vfplot program plots only arrows, it will not be a general purpose plotting program
- Free software
- Released under the GPLv3