memory usage

Does the following indicate that I have a memory leak?

gc(TRUE)

Garbage collection 22891 = 21012+1557+322 (level 2) ...
483257 cons cells free (59%)
11.0 Mbytes of heap free (82%)
         used (Mb) gc trigger (Mb)
Ncells 334906  9.0     818163 21.9
Vcells 309342  2.4    1746173 13.4

memory.size()/1024/1024 ## in MB

[1] 643.8978

sum(sapply(ls(all.names=TRUE),object.size))

[1] 1776

memory.limit()/1024/1024

[1] 600

I was repeatedly using try(eval(substitute(nlme(..)))), with lots of error
aborts from nlme.

--please do not edit the information below--

Version:
 platform = i386-pc-mingw32
 arch = x86
 os = Win32
 system = x86, Win32
 status =
 major = 1
 minor = 3.1
 year = 2001
 month = 08
 day = 31
 language = R

Windows 98 SE 4.10 (build 2222)  A

Search Path:
 .GlobalEnv, package:ctest, package:RBMDS, package:nls, package:nlme,
Autoloads, package:base

R. Woodrow Setzer, Jr.                                            Phone:
(919) 541-0128
Experimental Toxicology Division                       Fax:  (919) 541-5394
Pharmacokinetics Branch
NHEERL MD-74; US EPA; RTP, NC 27711

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