       Startingpoint and Initial region in Nminimize

• To: mathgroup at smc.vnet.net
• Subject: [mg101180] Startingpoint and Initial region in Nminimize
• From: laianhngoc at yahoo.com
• Date: Fri, 26 Jun 2009 06:49:08 -0400 (EDT)

```Hi All,

I have 2 problems :

+ I don't know if one can assign ONE Startingpoint when using Nminimize.

Example:

f[S_, T_] := S^2 + (T - 10)^2;
NMinimize[f[S, T], {{S, 2, 2.000001}, {T, 4, 4.00001}},
Method -> {"NelderMead", "InitialPoints" -> {{-2, 30}}}];

As you see, here i have an Initial region: {{S, 2, 2.000001}, {T, 4, 4.00001}}. The
"InitialPoints" serve only as a reference for the final result.

Now, i want Nminimize to take Exactly one Starting point (that i give For example {2,4}, not one region). Is it possible??? Sory if the question was already asked.

++ In addition, i observe that the Nminimize's iterations strongly depend on that Initial region. (Not in this simple case but in what i'm doing). Meaning:

We can have different result when the Initial region is larger (For example)
{{S, 2, 4}, {T, 4, 6}}
or smaller {{S, 2, 2.0000001}, {T, 4, 4.000001}}.

I do not see why??? because i think that this is just a starting point and the Initial region
can not influence the result of the optimization.

If someone have experiences about that two questions?

Thanks a lot and regard,
Anh.

```

• Prev by Date: Re: Plot with x value in Log
• Next by Date: Wolfram Alpha and Mathematica
• Previous by thread: Re: The Principle "Everything is an expression"
• Next by thread: Wolfram Alpha and Mathematica