This script cube.R allows for 3D phase plane analysis,
by defining the functions cube() and run3d()
that both use the plot3D library. The call to
cube() is similar to the call to plane(). The
cube.R script can be downloaded from the Grind directory. There are
three extra options:
1. shade="xyx" allows one to shade nullclines in the
x, y, and/or z direction. The
shading is off by default (shade="").
2. box=FALSE suppresses the drawing of the upper edges of
the cube.
3. grid=5 defines that 5 lines are used in the shading.
The viewpoint is defined by the defaults theta=40 and
phi=40, where theta gives the azimuthal
direction and phi the colatitude. One can use
plotdev(theta=60,phi=40) to change the viewpoint
afterwards. It is typically good top set
par(mar=c(0,0,0,0)) to reduce the margins.
The tutorial chaos3d
provides and example of calling cube() and
plot3d().
After also installing the rgl and the
plot3Drgl R-packages, one can call the
plotrgl() function to open a new window in which the
graphics can be rotated and zoomed with the mouse (try using the left
and right buttons).
Finally, if one prefers to have the origin in the left hand back
corner, with x pointing rightwards, y upwards,
and z forwards, call cube() and
run3d() with
(x=3, y=1, z=2, theta=130, ...).
cube <- function(x=1, y=2, z=3, xmin=0, xmax=1, ymin=0, ymax=1, zmin=0, zmax=1, xlab="", ylab="", zlab="", log="", shade="", grid=5, npixels=150, state=s, parms=p, odes=model, time=0, eps=0, show=NULL, zero=TRUE, add=FALSE, box=FALSE, lwd=1, ...) { }
run3d <- function(x=1, y=2, z=3, xmin=0, xmax=1, ymin=0, ymax=1, zmin=0, zmax=1, log="", col=1, add=FALSE, state=s, ...) { }