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Re: Problem with parametric minimization

  • To: mathgroup at smc.vnet.net
  • Subject: [mg90369] Re: Problem with parametric minimization
  • From: Stephan Heckmueller <stephan.heckmueller at gmx.net>
  • Date: Tue, 8 Jul 2008 02:21:53 -0400 (EDT)
  • References: <g4fhkl$9gs$1@smc.vnet.net> <g4flqh$c93$1@smc.vnet.net> <g4i962$3e9$1@smc.vnet.net> <g4kl80$lqc$1@smc.vnet.net>

Hi,
it seems to be a problem of Mathematica 5.2 (at least). With 6.0.2 it works
fine.

Thanks.

Jean-Marc Gulliet wrote:

> Stephan Heckmueller wrote:
>> Hi,
>> unfortunately I forgot to insert spaces between
>> the constants and the variable in my previous posting.
>> But as I said, it's the example from the mathematica
>> documentation only copy-pasted.
>> None of the alternatives work though. I'm using version
>> 5.2. Might that be a problem?
> 
> Possible. It works fine on my system (64-bit Intel Mac OS X 1.5.4
> Mathematica 6.0.2)
> 
> In[1]:= Minimize[a*x^2 + b*x + c, x]
> 
> Out[1]= {Piecewise[{{c, (b == 0 && a == 0) || (b == 0 && a > 0)},
>         {(-b^2 + 4*a*c)/(4*a), (b > 0 && a > 0) || (b < 0 &&
>         a > 0)}},
>       -Infinity],
>     {x -> Piecewise[{{0, (b == 0 && a == 0) || (b == 0 && a > 0)},
>             {-(b/(2*a)), (b > 0 && a > 0) || (b < 0 && a > 0)}},
>           Indeterminate]}}
> 
> In[2]:= $Version
> 
> Out[2]= "6.0 for Mac OS X x86 (64-bit) (February 7, 2008)"
> 
> Regards,
> -- Jean-Marc
> 
>> Thanks,
>> Stephan
>> 
>> Jens-Peer Kuska wrote:
>> 
>>> Hi,
>>>
>>> try:
>>>
>>> Minimize[a*x^2 + b*x + c, x]
>>>
>>> Regards
>>>    Jens
>>>
>>> Stephan Heckmueller wrote:
>>>> Hello,
>>>> I have a problem with with the examples for using the
>>>> Minimize function given in the documentation on wolfram.com:
>>>>
>>>> When trying:
>>>>         
>>>> Minimize[ax^2+bx+c,x]
>>>>
>>>> I receive the following error:
>>>>
>>>> Minimize::objv:
>>>> The objective function c+bx+ax^2 contains a nonconstant
>>>> expression c independent of variables (x).
>>>>
>>>> Is there something wrong with the command or the
>>>> documentation?
>>>>
>>>> Thanks.
>>>>
>>>>
>> 
>>



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