Re: no message from Minimize[] on a weird function(x^x) !?!
- To: mathgroup at smc.vnet.net
- Subject: [mg96742] Re: no message from Minimize[] on a weird function(x^x) !?!
- From: Simon <simonjtyler at gmail.com>
- Date: Mon, 23 Feb 2009 05:03:40 -0500 (EST)
- References: <gnr1d2$ep0$1@smc.vnet.net>
Hi Roger
If you tell Mathematica that x needs to be positive, all is well.
In[1]:= Minimize[x^x, x]
Out[1]= Minimize[x^x, x]
In[2]:= Minimize[{x^x, x > 0}, x]
Out[2]= {E^(-1/E), {x -> 1/E}}
In[3]:= FindMinimum[x^x, x]
Out[3]= {0.692201, {x -> 0.367879}}
In[4]:= N[%2]
Out[4]= {0.692201, {x -> 0.367879}}
In the help ref/Minimize it says
"Possible Issues: Minimize requires that all functions present in the
input be real-valued:"
Simon