x=linspace(-pi,pi,100);
y=x;
[X,Y]=meshgrid(x,y);
Z=cos(0.1+X.^2/5-X/3-Y/5+Y.^2/9);
surf(X,Y,Z)
max1=fminsearch('matlab_08_fce',[-4 -4]);
max2=fminsearch('matlab_08_fce',[-1 -1]);
max3=fminsearch('matlab_08_fce',[-3 3]);
max4=fminsearch('matlab_08_fce',[1 1]);