Azzera filtri
Azzera filtri

fixiing a component of input vector in fmincon

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Hi all,
I am using fmincon to optimize a nonlinear program as:
fun = @(x)obj_fun(x);
[w,fval] = fmincon(fun,w0,[],[],[],[],lb,ub,[],options);
I would like to know if there is possible to fix a component of x ?
let's assume x is in R^4 and the third component is fixed to 1. something like this:
x = (x1,x2,1,x3,x4)

Risposta accettata

Brendan Hamm
Brendan Hamm il 11 Mar 2015
There are multiple options for this (one is to simply fix it within your objective function). The other is to use your equality constraint of the form Aeq*x=beq. Set:
Aeq = [0 0 1 0 0];
beq = 1;
[w,fval] = fmincon(fun,w0,[],[],Aeq,beq,lb,ub,[],options);
The actual constraints are allowed to be violated within a specified tolerance. See the options for fmincon if you would like to control the tolerance.
  1 Commento
Saber
Saber il 12 Mar 2015
Thanks a lot for the answer. This is exactly what I was looking for.

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