henon - plot the phase space of the Henon system

henon-helporhenon[-widthinteger][-heightinteger][-skipinteger][-swap][-pointsinteger][-delayinteger][-Adou-ble][-Bdouble][-ulxdouble][-ulydouble][-llydouble][-boxinteger][-bulxdouble][-bulydou-ble][-bllydouble][-data][-inv][-maginteger][-termstring]

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.

-widthintegerWidth of the plot in pixels.-heightintegerHeight of the plot in pixels.-skipintegerNumber of initial points to skip.-swapSwap the x and y axis?-pointsintegerNumber of points to plot.-delayintegerTime steps to delay for.-AdoubleValue of the A parameter.-BdoubleValue of the B parameter.-ulxdoubleUpper-left corner x-coordinate.-ulydoubleUpper-left corner y-coordinate.-llydoubleLower-left corner y-coordinate.-boxintegerLine width for a box.-bulxdoubleBox's upper-left x-coordinate.-bulydoubleBox's upper-left y-coordinate.-bllydoubleBox's lower-left y-coordinate.-dataDon't plot, but print points.-invInvert all colors?-magintegerMagnification factor.-termstringHow to plot points.

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.

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

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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