Provided by: xppaut_6.11b+1.dfsg-1_amd64 
NAME
xppaut - X Phase plane plus AUTO. Solves many kinds of equations.
SYNOPSIS
xppaut [-silent] [-xorfix] [-convert]
[-newseed] [-ee] [-allwin]
[-white] [-setfile file] [-runnow]
[-bigfont font] [-smallfont font] [-parfile file]
[-outfile file] [-icfile file] [-grads boolean] [-bell boolean]
[-forecolor color] [-backcolor color] [-backimage image]
[-quiet boolean] [-logfile file] [-internset boolean] [-uset setname]
[-rset setname] [-include file] [-qics] [-qpars] [-qsets]
[-anifile file] [file...]
DESCRIPTION
xppaut is a tool for solving:
• differential equations
• difference equations
• delay equations
• functional equations
• differential-algebraic equation
• boundary value problems
• stochastic equations
The code brings together a number of useful algorithms and is written in C. All the
graphics and interface are created using the X Window System protocol client library Xlib
<http://www.xfree86.org>.
xppaut capabilities:
• Handles up to 1950 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 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 supported
• Some useful averaging theory tricks and various methods for dealing with coupled
oscillators
• Equations with Dirac delta functions are allowable
• Animations of simulations such as a little pendulum moving back and forth or lamprey
swimming
• A curve-fitter based on the Marquardt-Levenberg algorithm which lets you fit dynamical
systems to data
• Generate "movies" of three-dimensional views of attractors or parametric changes in
the attractor as some parameters vary
• Dynamically link to external subroutines
• From the command line type /dev/stdin as the file and you can write the ODE on the fly
OPTIONS
-silent
Batch run without the interface and dump solutions to a file
-xorfix
Work-around for exclusive Or with X on some monitors/graphics setups
-convert
Convert old style ODE files (e.g. phaseplane) to new ODE style
-newseed
Randomizes the random number generator which will often use the same seed
-ee
Emulates shortcuts of Evil Empire style (MS)
-allwin
Brings XPP up with all the windows visible
-white
Swaps foreground and background colors
-setfile filename
Loads the set file before starting up
-runnow
Runs ode file immediately upon startup (implied by -silent)
-bigfont font
Use the big font whose filename is given
-smallfont font
Use the small font whose filename is given
-parfile filename
Load parameters from the named file
-outfile filename
Send output to this file (default is output.dat)
-icfile filename
Load initial conditions from the named file
-forecolor color
Hexadecimal color (e.g. 000000) for foreground
-backcolor color
Hexadecimal color (e.g. EDE9E3) for background
-mwcolor color
Hexadecimal color (e.g. 808080) for main window
-dwcolor color
Hexadecimal color (e.g. FFFFFF) for drawing window
-backimage filename
Name of bitmap file (.xbm) to tile in background
For example, the following text saved to a file named stipple2.xbm can be loaded to
impart a stippled background.
#define stipple2_width 2
#define stipple2_height 2
static char stipple2_bits[] = {
0x02,0x01};
-grads B
Color gradients will (B=1) or will not (B=0) be used
-width N
Minimum width in pixels of main window
-height N
Minimum height in pixels of main window
-bell B
System bell on events will (B=1) or will not (B=0) be used
-internset B
Internal sets will (B=1) or will not (B=0) be run during batch run
-uset setname
Named internal set will be run during batch run
-rset setname
Named internal set will not be run during batch run
-include filename
Named file will be included (see include directive)
-qsets
Query internal sets (output saved to OUTFILE)
-qpars
Query parameters (output saved to OUTFILE)
-qics
Query initial conditions (output saved to OUTFILE)
-quiet B
Verbose log messages will (B=0) or will not be (B=1) written
-logfile filename
Verbose log messages are written to named file instead of stdout
-anifile filename
Load animation (.ani) from the named file
ENVIRONMENT
XPPSTART
File browser will open to the specified path. This may be useful in an
instructional setting to point to a mapped drive containing course materials.
XPPHELP
Path to the XPPAUT documentation file <xpphelp.html> (e.g.
/usr/share/doc/xppaut/html/xpphelp.html)
XPPBROWSER
Web browser to view documentation (e.g. /usr/bin/firefox)
FILES
Each user can customize the behavior and appearance of Xppaut via the file “$HOME/.xpprc”.
Where the environment variable $HOME points to the user's home directory. On most systems
$HOME will already be set. Each option line in .xpprc begins with the “@” symbol followed
by a comma-separated list of options. Comment lines begin with the “#” symbol and are
ignored.
# Example .xpprc file
@ maxstor=50000
@ meth=qualrk,tol=1e-6,atol=1e-6
#Set up a customized look
@ but=quit:fq,bell=1
@ bigfont=lucidasanstypewriter-bold-14,grads=1
# thats it
An list of the extensive options are given below. For complete description of each of
these options the reader is referred to the technical documentation for Xppaut.
ATOL, AUTOEVAL, AUTOVAR, AUTOXMAX, AUTOXMIN, AUTOYMAX, AUTOYMIN, AXES, BACK, BACKCOLOR,
BACKIMAGE, BANDLO, BANDUP, BELL, BIGFONT, BOUND, BUT, COLORMAP, DELAY, DLL_FUN, DLL_LIB,
DS, DSMAX, DSMIN, DT, DTMAX, DTMIN, DWCOLOR, EPSL, EPSS, EPSU, FOLD, FORECOLOR, GRADS,
HEIGHT, JAC_EPS, LOGFILE, LT, MAXSTOR, METH, MWCOLOR, NCOL, NEWT_ITER, NEWT_TOL, NJMP,
NMAX, NMESH, NORMMAX, NORMMIN, NPLOT, NPR, NTST, OUT, OUTPUT, PARMAX, PARMIN, PHI, POIMAP,
POIPLN, POISGN, POISTOP, POIVAR, PS_COLOR, PS_FONT, PS_FSIZE, PS_LW, QUIET, RANGE,
RANGEHIGH, RANGELOW, RANGEOLDIC, RANGEOVER, RANGERESET, RANGESTEP, RUNNOW, SEC, SEED,
SMALLFONT, SMC, SPC, STOCH, T0, THETA, TOL, TOR_PER, TOTAL, TRANS, UEC, UMC, UPC, VMAXPTS,
WIDTH, XHI, XLO, XMAX, XMIN, XNC, XP#, YHI, YLO, YMAX, YMIN, YNC, YP#, ZMAX, ZMIN, ZP#,
HELP
Note: On typical X Window installations the command xlsfonts lists available fonts. For
example, the following command lists only the available fixed width fonts:
xlsfonts | grep -i -e "typewriter" \
-e "mono" -e "^[0-9]x[0-9]" \
-e "fixed" -e "-c-" -e "-m-" | sort
Note: For a listing of standard hexadecimal colors see
<http://en.wikipedia.org/wiki/Web_colors>.
AUTHOR
This manual page was written by Isaac Jones <ijones@syntaxpolice.org>, for the Debian
GNU/Linux system on March 4, 2002. This man page was updated by D. P. Dougherty on Jan
4, 2011. This man page was updated by B. Ermentrout on Feb 26, 2011.