function f = himmelblau(x1, x2)
- ##
- ## The eponymous function defined by Himmelblau in his Applied
- ## Nonlinear Programming, 1972.
- ##
- ## It has four identical local minima,
- ##
- ## * f(3,2) == 0
- ##
- ## * f(-2.805118086952745, 3.131312518250573) == 0
- ##
- ## * f(-3.779310253377747, -3.283185991286170) == 0
- ##
- ## * f(3.584428340330492, -1.848126526964404) == 0
- ##
+ %
+ % The eponymous function defined by Himmelblau in his Applied
+ % Nonlinear Programming, 1972.
+ %
+ % It has four identical local minima,
+ %
+ % * f(3,2) == 0
+ %
+ % * f(-2.805118086952745, 3.131312518250573) == 0
+ %
+ % * f(-3.779310253377747, -3.283185991286170) == 0
+ %
+ % * f(3.584428340330492, -1.848126526964404) == 0
+ %
f = (x1^2 + x2 - 11)^2 + (x1 + x2^2 - 7)^2;
end