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MATLAB: Adding 2d plot to 3d surface

  1. Aug 10, 2012 #1
    Consider the 3d graph of a quadratic form: 1/2*trans(x)*A*x-trans(b)*x

    Plot via matlab: surfc(X,Y,Z);

    add following lines:
    hold on

    This plot a straight line which intersects the 3d surface. However, I wish for it be graphed on the contours: i.e. the 3d graph has contours where Z=-200. The plot(x,y) plots the straight line on the z=0 plane. I wish for it graph the straight line on the z=-200 plane.

    I've considered doing a loops such that I graph single points for the z=-200 plane.

    Thank you.
  2. jcsd
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