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Re: Root search on results of minimization with free parameter

• To: mathgroup at smc.vnet.net
• Subject: [mg114787] Re: Root search on results of minimization with free parameter
• From: Themis Matsoukas <tmatsoukas at me.com>
• Date: Fri, 17 Dec 2010 03:28:16 -0500 (EST)

Hi Philipp,

Nminimize is a numerical function and cannot be used on example[c, x] unless you provide a numerical value for c. This is what the error message says:

NMinimize::nnum: The function value 0.0929857+c/2 is not a number at {x} = {0.30493561594805696`}

It seems what you want is to minimize with respect to both c and x. You can do this in one step:

Minimize[{example[c, x], 0 <= c <= 1}, {c, x}]

{0, {c -> 0, x -> 0}}

I placed the constraint 0 <= c <= 1 in order to get e unique answer in this example. 

Themis