Optimization of an simple problem with multi parameters
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Hello,
I just want to do any easy optimization with matlab, but i need a tip how to do it.
Here is the question:
I have 3 different parameters (a,b,c) which are effecting the result and one result (d). I need to minimize the result by changing the paramaters. How can i do it matlab?
Example:
a=50 b=100 c= 90 -----> d=45
a=80 b=70 c= 60 -----> d=23
a=20 b=65 c= 40 -----> d=58
a=30 b=134 c= 93 -----> d=71
a=40 b=150 c= 36 -----> d=62
a=54 b=100 c= 24 -----> d=25
a=? b=? c=? -------> Min(d) ?
thank you
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Réponses (1)
Matt J
le 1 Oct 2012
Use an Optimization Toolbox function if you've got it
Otherwise, try the FMINSEARCH command.
5 commentaires
Matt J
le 3 Août 2013
Modifié(e) : Matt J
le 3 Août 2013
As Roger told you here,
we would have to see the full form of the function you're maximizing (and the constraints) to know whether fmincon is applicable. ln(1+a*x1+b*x2) is obviously not the full form, because you say that a,b are further functions of x1,x2. So you really have
max ln(1+a(x1,x2)*x1+b(x1,x2)*x2)
We have to know what the dependences a(x1,x2) and b(x1,x2) look like. For one thing, fmincon will only solve 2nd order smooth problems, so we need to know if a() and b() satisfy those smoothness conditions.
econgrad
le 11 Août 2013
Thanks for your reply, actually I have something like this: a=a(x1,x2,c1,c2) and b=b(x1,x2,c1,c2). When x1 and x2 changes, c1 and c2 would also change and that change has to obtained by finding the fixed points of a(x1,x2,c1,c2) and b(x1,x2,c1,c2). After finding the new c1,c2 by fixed point iteration, I get a new a(x1,x2,c1,c2) & b(x1,x2,c1,c2).
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