MATLAB: Find a max value in function

function max value

[x,y] = meshgrid(-2 : 0.5 : 2 , -5 : 0.5 : 5);
z = ( 5*x.^2 )+( y.^3 )+10*x;
mesh(x,y,z);
xlabel('x-axis');
ylabel('y-axis');
zlabel('z-axis');
i'm troble in this problem
i ask something this problem, present i make a 3dimension function graph
and i want find a max value , min value in z and add mark to max value , min value
please help me
i'm not good at englinsh. sorry

Best Answer

  • Add the below after mesh() call:
    mx = z==max(z(:));
    mn = z==min(z(:));
    hold on
    plot3(x(mx),y(mx),z(mx),'ok')
    plot3(x(mn),y(mn),z(mn),'or')