function y=testfunc(x)
%  x is assumed to be dimension x number of points
%  Un-comment the function desired

% Basic 2-d paraboloid
%y=x(1,:).^2+x(2,:).^2;

%Rosenbrock's parabolic valley (Benchmark start: (-1.2, 1)
%y=100*(x(2,:)-x(1,:).^2).^2+(1-(x(1,:))).^2; 

%Powell's Quartic (Benchmark start: (3,-1,0,1)
y=(x(1,:)+10*x(2,:)).^2+5*(x(3,:)-x(4,:)).^2+(x(2,:)-2*x(3,:)).^4+10*(x(1,:)-x(4,:)).^4;