[Date Index]
[Thread Index]
[Author Index]
Specifying significant figures in FindMinimum
*To*: mathgroup at smc.vnet.net
*Subject*: [mg31027] Specifying significant figures in FindMinimum
*From*: "Toshiyuki \(Toshi\) Meshii" <meshii at mech.fukui-u.ac.jp>
*Date*: Wed, 3 Oct 2001 02:49:15 -0400 (EDT)
*Sender*: owner-wri-mathgroup at wolfram.com
Hello,
I was wondering whether I can specify significant figures in FindMinimum as
one of a calculation condition.
Though AccuracyGoal or PrecisionGoal may be candidates, I am not confident
about that.
Let me explain my problem.
Suppose I want to find a minimum of a function f[x].
And suppose I know that f[x] shows a minimum close to x = 3.55.
In this case, I will usually do
FindMinimum[ f[x], {x, 3.55} ]
The answer Mathematica returns is like "f[x] shows minimum at x =
3.58123456."
I do not need this.
I just want to find a minimum of f[x] for 3 significant figures for x, like
x = 3.58.
In other words, I am satisfied if I just know that
f[3.58] < f[3.57]
f[3.58] < f[3.59]
I prefer calculation of f[x] in WorkingPrecision, but search in x for 3
significant figures is enough.
Can someone help me on my problem?
********************************************************
Toshiyuki (Toshi) Meshii meshii at mech.fukui-u.ac.jp
Department of Mechanical Engineering
Fukui University, 3-9-1 Bunkyo, Fukui, 910-8507, JAPAN
Tel & Fax +81-776-27-8468
http://mech.fukui-u.ac.jp/~meshii/meshii.htm
********************************************************
Prev by Date:
**Specifying jobs in Parallel Computing**
Next by Date:
**Re: Urgent but simple problem III**
Previous by thread:
**Re: Specifying jobs in Parallel Computing**
Next by thread:
**Slow mathematica program help**
| |