[Scipy-tickets] [SciPy] #390: scipy.optimize.fmin_bfgs fails without warning

SciPy scipy-tickets@scipy....
Thu Jul 19 07:08:47 CDT 2007


#390: scipy.optimize.fmin_bfgs fails without warning
----------------------------+-----------------------------------------------
 Reporter:  ycopin          |        Owner:  somebody
     Type:  defect          |       Status:  new     
 Priority:  normal          |    Milestone:          
Component:  scipy.optimize  |      Version:          
 Severity:  normal          |   Resolution:          
 Keywords:                  |  
----------------------------+-----------------------------------------------
Comment (by ycopin):

 Agree: the routine gets lost in a local minimum (actually a plateau),
 where indeed the chi2 jacobian gets arbitrary close to 0 (see attached
 figures, in particular buggy_space.png). So it's probably not a bug indeed
 (altough I wish the routine could issue a warning).

-- 
Ticket URL: <http://projects.scipy.org/scipy/scipy/ticket/390#comment:5>
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