typing starting values in FindMinimum
- To: mathgroup at smc.vnet.net
- Subject: [mg15391] typing starting values in FindMinimum
- From: "Albert Maydeu-Olivares" <amaydeu at nil.fut.es>
- Date: Tue, 12 Jan 1999 03:14:53 -0500
- Organization: University of Barcelona
- Sender: owner-wri-mathgroup at wolfram.com
Hi everyone,
Consider the use of FindMinimum when the function to be minimized
depends on several variables
In[1]:=
j={{l2,l1,0},{l3,0,l1},{0,l3,l2}};
e={0.56 -l1 l2,0.48 -l1 l3, 0.42 -l2 l3};
FindMinimum[Apply[Plus,e^2],{l1,.5},{l2,.5},{l3,.5},Method->Newton,
Gradient->j]
Out[1]=
{8.68919*^-23, {l1->.8, l2->.7, l3->.6}}
Does anyone know to avoid having to type in all the variables names and
starting values?
I have some problems with 100 variables!
Of course I can construct
In[3]:=
theta={l1,l2,l3};
start ={0.5,0.5,0.5};
startval=Transpose[{theta,start}]
Out[3]:=
{{l1,0.5},{l2,0.5},{l3,0.5}}
but that is not what FindMinimum is expecting.
--
Albert Maydeu-Olivares Tel. +34 3 4021079 ext. 3099 Faculty of
Psychology Fax. +34 3 4021362 University of Barcelona E-Mail:
amaydeu at tinet.fut.es Passeig de la Vall d'Hebron, 171.
08035 - Barcelona (Spain)