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# McCORMICK FUNCTION

Updated: Jul 19, 2021   Mathematical Definition Input Domain

The McCormick Function is defined on input range [-1.5<x< 4] and [-3<y<3].

Global Minima

The McCormick Function has one global minimum

fx* = -1.9133 at x* = (-0.547, -1.547).

Description and Features

The McCormick Function is defined on two dimensional spaces. This function is used as a test function in order to evaluate the performance of optimization algorithms such as:

• Convergence rate

• Precision

• Robustness

• General Performance.

The McCormick Function is a

• Multi-modal

• Continuous

• Convex

• Differentiable

Python Implementation

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import matplotlib.pyplot as plt
import numpy as np
from numpy import sin
from mpl_toolkits import mplot3d

def f(x,y):

return  sin(x+y)+((x-y)**2)-1.5*x+2.5*y+1

x=np.linspace(4,-2)
y=np.linspace(4,-4)

x,y=np.meshgrid(x,y)
results=f(x,y)

fig =plt.figure(figsize=(9,9))
axis=fig.gca(projection='3d')
axis.contour3D(x,y,results,450)

axis.set_xlabel('X')
axis.set_ylabel('Y')
axis.set_zlabel('Z')
axis.set_title('McCormick Function')
axis.view_init(50,50)

#plt.contour(x,y,results,15)
plt.show()```

References:

 Jamil, Momin, and Xin-She Yang. "A literature survey of benchmark functions for global optimization problems." International Journal of Mathematical Modelling and Numerical Optimization 4.2 (2013): 150-194.