File: ex2.py

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# Python
from casadi import *

# Formulate the NLP
x=SX.sym('x')
y=SX.sym('y')
z=SX.sym('z')
f=x**2+100*z**2
g=z+(1-x)**2-y
P=dict(x=vertcat(x,y,z),\
       f=f,g=g)

# Create solver instance
F=nlpsol('F','ipopt',P)

# Solve the problem
r=F(x0=[2.5,3.0,0.75],\
    ubg=0, lbg=0)
print(r['x'])