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Creating Stream Particle Animations  What Particle Animations
Can Show  A stream particle animation is useful for visualizing
the flow direction and speed of a vector field. The "particles"
(represented by any of the line markers) trace the flow along a
particular stream line. The speed of each particle in the
animation is proportional to the magnitude of the vector field
at any given point along the stream line.  1. Specify Starting
Points of the Data Range  This example determines the region of
the volume to plot by specifying the appropriate starting
points. In this case, the stream plots begin at x = 100 and y
spans 20 to 50 in the z = 5 plane, which is not the full volume
bounds.  load wind [sx sy sz] = meshgrid(100,20:2:50,5);  2.
Create Stream Lines to Indicate Particle Paths  This example
uses stream lines (stream3, streamline) to trace the path of the
animated particles, which adds a visual context for the
animation.  sl = streamline(verts