R help - Jul 2007 - stop criteria when "L-BFGS-B needs finite values of 'fn' " in optim

Hi all!

I'm running some simulations and I need to estimate some paramaters with
optim( ),
 in some cases optim stops with the next message:

                               "L-BFGS-B needs finite values of
'fn' "

I would like to know how to include and "if" condition when this
happen,
could it be something like:

myfun <- optim(....)         #   run my function

????
if(myfun == ERROR) ..... #   when the error message is "L-BFGS-B needs
finite values of 'fn'
????

I've succesfully achieved when, for example convergence is not reached,

if(myfun$convergence != 0)

but I don't know how to do it in the other case

Any help??


Thanks in advance,

Dae-Jin



-- 
__________________________________

Dae-Jin Lee
Despacho: 7.3.J04
Tlfno: 91 624 9175
Fax:  91 624 9430
Departamento de Estadística
Av. Universidad 30, Ed. Juan Benet
28911 Leganés (Madrid)
Universidad Carlos III de Madrid

e-mail: dae-jin.lee@uc3m.es
   web: http://www.est.uc3m.es/daejin
__________________________________

	[[alternative HTML version deleted]]

Dae-Jin Lee <dae-jin.lee <at> uc3m.es> writes:
> 
> 
> I would like to know how to include and "if" condition when this
happen,
> could it be something like:
> 
> myfun <- optim(....)         #   run my function
> 
> ????
> if(myfun == ERROR) ..... #   when the error message is "L-BFGS-B needs
> finite values of 'fn'
> ????
> 
  See ?try :

e.g.

 myfun <- try(optim(...))
  if (class(myfun)=="try-error") { ... whatever ...
   } else {
     ... success ...
   }
  
  or tryCatch

  this is FAQ 7.32 ...

  cheers
    Ben Bolker