Bubble plot

[Kyle Altendorf]

Does octave have any sort of bubble plot function?  Along the lines of:

http://epa.gov/ncer/progress/images/X832541C003_07_001.jpg
http://www.geoafrica.co.za/reddog/gsw/grapher/3Dbubble.gif

I started to create a rough version by making multiple plot calls
using 'o' markers and varying sizes but figured I would ask if anyone
knows of a better way I haven't found in the documentation (or web
search) yet.  Maybe at least a disc (filled circle) rather than an
open one?  Alternatively, can you recommend another way to visualize
the diameters of a field of dots on a plane?  I would use surf (and
have for this previously) but some points are missing and I would
rather not fill them in with fake data.

Thanks for any pointers,
-kyle