#### NAME

henon - plot the phase space of the Henon system

#### SYNOPSIS

henon -help
or
henon  [-width  integer] [-height integer] [-skip integer]
[-swap] [-points integer] [-delay integer] [-A dou-
ble]  [-B double] [-ulx double] [-uly double] [-lly
double] [-box integer] [-bulx double]  [-buly  dou-
ble]  [-blly  double] [-data] [-inv] [-mag integer]
[-term string]

#### DESCRIPTION

The phase space of the Henon system, which is described by
the  equation x(t+1) = A - x(t)^2 + B * x(t - 1), is plot-
ted according to the specified parameters.

#### OPTIONS

-width integer
Width of the plot in pixels.

-height integer
Height of the plot in pixels.

-skip integer
Number of initial points to skip.

-swap  Swap the x and y axis?

-points integer
Number of points to plot.

-delay integer
Time steps to delay for.

-A double
Value of the A parameter.

-B double
Value of the B parameter.

-ulx double
Upper-left corner x-coordinate.

-uly double
Upper-left corner y-coordinate.

-lly double
Lower-left corner y-coordinate.

-box integer
Line width for a box.

-bulx double
Box's upper-left x-coordinate.

-buly double
Box's upper-left y-coordinate.

-blly double
Box's lower-left y-coordinate.

-data  Don't plot, but print points.

-inv   Invert all colors?

-mag integer
Magnification factor.

-term string
How to plot points.

#### MISCELLANY

The method for  choosing  the  viewable  region  may  seem
counter-intuitive  at  first, but it has some nice proper-
ties.  In particular, selecting the exact (x,  y)  coordi-
nates  for  the  upper-left  corner and only selecting the
lower right y coordinate forces both the x and y scales to
be  identical  since all scales are uniquely determined by
these values along with the plot width and height.  If you
then  change the width or height of the plot, the relative
scales will still match up.  The options for making a  box
work similarly.

#### BUGS

No  sanity  checks  are performed to make sure that any of
the options make sense.

#### AUTHOR

Copyright (c) 1997, Gary William Flake.

Permission granted for any use according to  the  standard
GNU ``copyleft'' agreement provided that the author's com-
ments are neither modified nor removed.   No  warranty  is
given or implied.

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