MATLAB: How to plot “f(x,y) = x^2 * y” function in matlab

plot3dsurf

I am a beginner, so I am familiar with matlab. I am trying to plot a function: f(x, y) = x^2 * y, but it looks like something wrong. I am also trying another way but it looks different with a result I got from Google. Is there anybody have experience this problem, help me please?
The method I am trying is: x = rcost, y = rsint -> f(r, t) = r^2 * cos^2(t) * r * sin(t)
    ra = linspace(-2.0, 2.0);
    theta = linspace(-0.5*pi, 0.5*pi);
    [TH, RA] = meshgrid(theta, ra);
    F = RA.^3 * cos(TH) * cos(TH) * sin(TH);
    surf(TH,RA,F);
    shading interp;

Best Answer

Try this:
x = linspace(-2.0, 2.0, 50);
y = linspace(-2.0, 2.0, 50);
[xm, ym] = meshgrid(x, y);
fxy = xm.^2 .* ym;
surf(fxy);
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);
It gives you almost exactly what you want. You just have to rotate the viewpoint of the axis. I trust you can do this.
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