[R] Error bars.

[Rolf Turner]

There was an inquiry on this list recently about plotting some simple
error bars on a graph.  Now Splus has a function (error.bar ---
originally written by Sue Clancy of DMS, CSIRO, I believe) to do this
job virtually at the touch of a key.  (Well a few keys. :-) )  The
error.bar function is written completely in raw S --- no calls to
``.Internal'' or anything like that.  So it would be trivial to port
over to R.

My question is:  Is doing so legal?  Moral?  (Given that Splus is
proprietary, and error.bar is a ``built-in'' part of that package,
and not something out of statlib, or like that.)

				cheers,

					Rolf Turner
					rolf at math.unb.ca
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