-----Original Message-----
From: r-help-bounces@r-project.org on behalf of yehengxin
Sent: Sat 10/1/2011 8:12 AM
To: r-help@r-project.org
Subject: [R] Poor performance of "Optim"
 
I used to consider using R and "Optim" to replace my commercial packages:
Gauss and Matlab.  But it turns out that "Optim" does not converge
completely.  The same data for Gauss and Matlab are converged very well.  I
see that there are too many packages based on "optim" and really doubt if
they can be trusted!  

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Considering that your post is pure whining without any evidence or reproducible example, considering that you speak of 'data' being converged, me think it's your fault, you cann't
control optim well enough to get sensible results. There are many ways to use optim eh?, you can pass on the gradients, you can use a variety of methods, you can increase the number of iterations, et cetera, read optim's help, come back with a reproducible example, or quietly stick to your commercial sofware, leaving the whining to yourself.

HTH

Ruben 

--
Rubén H. Roa-Ureta, Ph. D.
AZTI Tecnalia, Txatxarramendi Ugartea z/g,
Sukarrieta, Bizkaia, SPAIN


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