xppaut(1)
NAME
xppaut - X Phase plane plus AUTO. Solves many kinds of equations.
SYNOPSIS
xppaut [options] file
DESCRIPTION
This manual page documents briefly the xppaut command. This manual
page was written for the Debian distribution because the original program does not have a manual page. Instead, it has documentation in
HTML format; see below.
- xppaut is a tool for solving
- * differential equations,
* difference equations,
* delay equations,
* functional equations,
* differential-algebraic equation,
* boundary value problems, and
* stochastic equations. - The code brings together a number of useful algorithms and is extremely portable. All the graphics and interface are written completely in Xlib which explains the somewhat idiosyncratic and primitive widgets interface.
- XPP has the capabilities for handling up to 1800 differential equations.
- * There are over a dozen solvers including several for stiff systems,
- a solver for integral equations and a symplectic solver.
- * Up to 10 graphics windows can be visible at once and a variety of
- color combinations is supported.
- * PostScript output is supported as well as GIF and animated GIF
- movies
- * Post processing is easy and includes the ability to make histograms,
- FFTs and applying functions to columns of your data.
- * Equilibria and linear stability as well as one-dimensional invariant
- sets can be computed.
- * Nullclines and flow fields aid in the qualitative understanding of
- two-dimensional models.
- * Poincare maps and equations on cylinders and tori are also sup
- ported.
- * Some useful averaging theory tricks and various methods for dealing
- with coupled oscillators are included primarily because that is what I do for a living.
- * Equations with Dirac delta functions are allowable.
* I have added an animation package that allows you to create animated - versions of your simulations, such as a little pendulum moving back and forth or lamprey swimming. See toys! for examples.
- * There is a curve-fitter based on the Marquardt-Levenberg algorithm
- which lets you fit data points to the solutions to dynamical systems.
- * It is possible to automatically generate ``movies'' of three-dimen
- sional views of attractors or parametric changes in the attractor as some parameters vary.
- * Dynamically link to external subroutines
OPTIONS
- -silent
- Runs without the interface - computes solutions and dumps to a file
- -xorfix
- On some monitors/graphics setups, the exclusive Or with X doesn't quite work right and this fixes it
- -convert
- Converts old style ODE files (from the DOS program phaseplane) to the much more intuitive new style ODE file
- -newseed
- Randomizes the random number generator which will often use the same seed
- -allwin
- Brings XPP up with all the windows visible
- -ee Emulates shortcuts of Evil Empire style (MS)
- -setfile <filename>
- Loads the set file before starting up
EXAMPLES
cd to /usr/share/doc/xppaut/examples/ode
run xppaut and select from the menu
SEE ALSO
See the HTML documentation in /usr/share/doc/xppaut/html/
AUTHOR
- This manual page was written by Isaac Jones <ijones@syntaxpolice.org>,
for the Debian GNU/Linux system (but may be used by others).