Re: R-beta: deriv()

Ross Ihaka (ihaka@stat.auckland.ac.nz)
Sun, 6 Jul 1997 10:48:56 +1200 (NZST)


Date: Sun, 6 Jul 1997 10:48:56 +1200 (NZST)
From: Ross Ihaka <ihaka@stat.auckland.ac.nz>
Message-Id: <199707052248.KAA23552@stat1.stat.auckland.ac.nz>
To: r-testers@stat.math.ethz.ch, thomas@biostat.washington.edu
Subject: Re:  R-beta: deriv()

> The deriv() function does not set the class of the result to "expression".
> This means that eval() must be used twice to evaluate the function.

This is very timely.  I have just added a new expression "type" as
opposed to "object" to support mathematical annotation in graphs.
deriv() needs to be converted to the new scheme.  I had forgotten
about it.  The new version is nearly ready.
	Ross
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