Does anyone know how to plot a dome (aka half sphere) in MATLAB...or anyother programming language?

I need to plot a dome or half a sphere and be able to change the dim开发者_开发问答ensions of the dome. I figured MATLAB would be my best choice.

any suggestions?

THanks

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The SPHERE function generates x, y, and z coordinates for a spherical surface. You just have to remove points corresponding to the bottom of the sphere to make a dome. For example:

[x,y,z] = sphere;      %# Makes a 21-by-21 point sphere
x = x(11:end,:);       %# Keep top 11 x points
y = y(11:end,:);       %# Keep top 11 y points
z = z(11:end,:);       %# Keep top 11 z points
r = 3;                 %# A radius value
surf(r.*x,r.*y,r.*z);  %# Plot the surface
axis equal;            %# Make the scaling on the x, y, and z axes equal

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take a look at surf. the formula for a sphere is

x^2+y^2+z^2 = R^2

you may also need meshgrid

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Here's a starting point:

R = 7;
[X,Y] = meshgrid(-10:.1:10);
Z = sqrt(R.^2 - X.^2 - Y.^2);
Z(imag(Z) ~= 0) = 0;
mesh(X,Y,Z);

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I took a circle graph I made and adapted it to graph a dome. I can't test it but it should work since the circle worked fine.

I made this in JavaScript. setVox is just a function that will print a voxel on a 3D plane.

  var rad = 1; //radius

  for (var z = -(rad); z < 0; z++) {
    r = Math.round(Math.sqrt(Math.pow(rad,2) - Math.pow(z,2)));
    for (var x = -(r); x < r; x++) {
      y = Math.round(Math.sqrt(Math.pow(r,2) - Math.pow(x,2)));
      setVox(x,y,z);
      setVox(x,-(y),z);
    }
    for (y = -(r); y < r; y++) {
      x = Math.round(Math.sqrt(Math.pow(r,2) - Math.pow(y,2)));
      setVox(x,y,z);
      setVox(-(x),y,z);
    }
  }