function y=banana(x)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Rosenbrock's Banana Function
%
% INPUTS:
%      x: A vector in R^2.    
%
% OUTPUT:
%      y: the value of the banana function
%
% Written by Martin Heller on May 12, 2008
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    y = 100*(x(2)-x(1)^2)^2+(1-x(1))^2;
end