## If we have non-linear constraint can we use "quadprog"

### RAHUL KUMAR (view profile)

on 19 Sep 2019
Latest activity Commented on by Matt J

on 19 Sep 2019

### John D'Errico (view profile)

I have non-linear function and linear constraint so we can use "quadprog" algorithm.so my question is if i have non-linear objective function and no-linear constraint function ,can we use "quadprog" algorithm if not then which algorithm use

### John D'Errico (view profile)

on 19 Sep 2019
Edited by John D'Errico

### John D'Errico (view profile)

on 19 Sep 2019

No. Quadprog is only able to accept LINEAR constraints. (equality, inequality, as well as bound constraints on the parameters. But they are all linear.)
Anyway, if your function is itself generally nonlinear, as opposed to a quadratic form, then you still cannot use quadprog.
You can use fmincon though, as it does accept nonlinear constrints.

Matt J

### Matt J (view profile)

on 19 Sep 2019
(x-2)^2+(y-3)^2+6=0 and x^2+6=0
Thes constraints are infeasible. They have no real-valued solutions. Did you mean perhaps,
(x-2)^2+(y-3)^2 - 6 = 0 and
x^2 - 6 = 0
If you don't want to use fmincon, it would be best for you to tell us why and in what way the alternative needs to be better.
Matt J

on 19 Sep 2019
fmincon