#### 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.