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NMinimize Bug in Mathematica 7.0?

• To: mathgroup at smc.vnet.net
• Subject: [mg96197] NMinimize Bug in Mathematica 7.0?
• From: appris at att.net
• Date: Mon, 9 Feb 2009 05:33:37 -0500 (EST)

Here is an example from Mathematica's user's guide:

In[8]:= NMinimize[x^4 - 3 x^2 + x, x]

Out[8]=  {-3.513905039, {x -> -1.300839566}}

however, trying to replicate it, I get the following:

In[2]:= NMinimize[x^4 - 3 x^2 + x, x]

Out[2]= {-1.070230182, {x -> 1.130901122}}

One way to find the global min, I had to use a constraint such as x<0.

Has anyone come across such a problem?

In[3]:= $Version

Out[3]= "7.0 for Microsoft Windows (32-bit) (November 10, 2008)"

Thanks.

• Follow-Ups:
  • Re: NMinimize Bug in Mathematica 7.0?
    • From: "Jaccard Florian" <Florian.Jaccard@he-arc.ch>
  • Re: NMinimize Bug in Mathematica 7.0?
    • From: Brett Champion <brettc@wolfram.com>