[SciPy-dev] GSoC weekly report
Alan G Isaac
aisaac at american.edu
Sat Aug 4 11:29:56 EDT 2007
On Sat, 04 Aug 2007, dmitrey apparently wrote:
> scipy.optimize.line_search.
> Unfortunately, that one seems to be obsolete and no maintained any more,
> noone can (or want) answer about old_fval and old_old_fval parameters
1. Please make a distinction between "obsolete" and "not
maintained". This is not obsolete and the lack of
maintenance reflects its satifactory state (aside from
documentation). Please see the example of use in
the definition of fmin_bfgs
http://svn.scipy.org/svn/scipy/trunk/Lib/optimize/optimize.py
2. Your problem certainly is showing the inadequacy of
documentation of this code. However the two old function
values are being used to compute an initial step, as
documented at
http://svn.scipy.org/svn/scipy/trunk/Lib/optimize/minpack2/dcsrch.f
The documentation there is quite good.
The line search code is essentially an interface to the
dcsrch code.
Cheers,
Alan Isaac
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