[Rd] Accessing options of L-BFGS-B

From: Paul Bailey <pdbailey_at_umd.edu>
Date: Wed, 07 Jul 2010 11:27:06 -0700 (PDT)

Hi,

I use L-BFGS-B heavily and I want access to some of the options in the code that R calls but does not provide access to. There are some knobs on the convergence criteria that are not accessible via optim, specifically, I want to require a maximum gradient (obviously, it is actually some norm of the gradient vector so that the requirement is 1 dimensional). I want to do this because rerunning from various starting points gives me poor convergence and my own (pure-R) L-BFGS has a poor line search algorithm that sometimes fails.

Is there a simple way to do this?

As an alternative, the BFGS type papers tend to be long on the BFGS explanations and short on the line search explanations. If someone pointed me to a good line search paper that uses the Wolfe conditions...

Thanks,
Paul Bailey

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