Re: FindMinimum is not obeying my bounds

*To*: mathgroup at smc.vnet.net*Subject*: [mg62687] Re: [mg62652] FindMinimum is not obeying my bounds*From*: Bruce Miller <brucem at wolfram.com>*Date*: Wed, 30 Nov 2005 22:08:57 -0500 (EST)*References*: <200511300507.AAA00125@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

On Nov 29, 2005, at 11:07 PM, Chris Chiasson wrote: > Dear MathGroup, > > FindMinimum is not obeying my bounds: > > In[1]:= > FindMinimum[(x-1)^2,{x,-80,-100,-70}] > Out[1]= > {0.,{x\[Rule]1.}} > > Version Number: 5.2.0.0 > Platform: Windows > > How does this turn out on your computers? > > Regards, > -- > http://chrischiasson.com/contact/chris_chiasson > This is method-dependent. (Known issue) In[1]:= $VersionNumber Out[1]= 5.2 In[2]:= FindMinimum[(x-1)^2,{x,-80,-100,-70}] Out[2]= {0., {x -> 1.}} In[3]:= FindMinimum[(x-1)^2,{x,-80,-100,-70}, Method->Newton] FindMinimum::reged: The point {-70.} is at the edge of the search region {-100., -70.} in coordinate 1 and the computed search direction points outside the region. More? Out[3]= {5041., {x -> -70.}} In[4]:= FindMinimum[(x-1)^2,{x,-80,-100,-70}, Method->ConjugateGradient] FindMinimum::reged: The point {-70.} is at the edge of the search region {-100., -70.} in coordinate 1 and the computed search direction points outside the region. More? Out[4]= {5041., {x -> -70.}} In[5]:= FindMinimum[(x-1)^2,{x,-80,-100,-70}, Method->Gradient] FindMinimum::regex: Reached the point {1.} which is outside the region {{-100.}, {-70.}}. More? FindMinimum::regex: Reached the point {1.} which is outside the region {{-100.}, {-70.}}. More? Out[5]= 2 FindMinimum[(x - 1) , {x, -80, -100, -70}, Method -> Gradient] In[6]:= FindMinimum[(x-1)^2,{x,-80,-100,-70}, Method->LevenbergMarquardt] Out[6]= {0., {x -> 1.}} In[7]:= FindMinimum[(x-1)^2,{x,-80,-100,-70}, Method->QuasiNewton] FindMinimum::reged: The point {-70.} is at the edge of the search region {-100., -70.} in coordinate 1 and the computed search direction points outside the region. More? Out[7]= {5041., {x -> -70.}} =====================================