nlm on a function in the Math group (PR#180)

[bates@stat.wisc.edu]

If nlm is called with a function in the Math group it causes a
segmentation violation in DispatchGroup.  For example
 R> nlm( sin, -0.5, print.level = 2 )

 Process R segmentation fault at Thu Apr 29 17:10:15 1999

--please do not edit the information below--

Version:
 platform = i686-unknown-linux
 arch = i686
 os = linux
 system = i686, linux
 status = Patched (unreleased snapshot)
 status.rev = 0
 major = 0
 minor = 64.0
 year = 1999
 month = April
 day = 29
 language = R

Search Path:
 .GlobalEnv, Autoloads, package:base

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