There should be a 32 bit version in \addons\math\lbfgs for j602. I copied the directory and contents to \addons\math\lbfgs for j805 and it seemed to work ok, after removing:

script_z_ '~system\main\dll.ijs'

Let me know if this works for you.

All the best,
David Mitchell

On 6/27/2017 10:38, 'Jon Hough' via Programming wrote:
I was wondering whether the math addons contained an implementation of the 
LBFGS algorithm. I couldn't find anything, except this cryptic
entry in the wiki:
http://code.jsoftware.com/wiki/Addons/math/lbfgs

Looking through the math addon files I couldn't find anything resembling this.
Does such an addon exist anywhere?

Thanks,
Jon

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