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Orientation of ellipsoid

Asked by Sakshi

Sakshi (view profile)

on 13 Jun 2011

Hello, I am using ellipsoid function to represent an ellipsoid graphically. The input list requires me to enter the coordinates of the centre of ellipsoid and its semi-axes. There is no input for the orientation of the axis of the ellipsoid with respect to the coordinate system. Is there any way, this can be incorporated if my ellipsoids are at angle with respect to x, y and z axis.

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Sakshi

Sakshi (view profile)

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2 Answers

Answer by Matt Fig

Matt Fig (view profile)

on 13 Jun 2011
Accepted answer

See the help for the ROTATE function.

For example:

[x, y, z] = ellipsoid(0,0,0,5.9,3.25,3.25,30);
S = surfl(x, y, z);
colormap copper
axis equal
xlabel('X')
ylabel('Y')
zlabel('Z')
pause %  Push return to see the rotation take place.
rotate(S,[0 0 1],45)

10 Comments

Matt Fig

Matt Fig (view profile)

on 15 Jun 2011

Of course they change.

>> plot_ellipse
>> Z = get(S,'zdata'); % Get the zdata before rotation.
>> rotate(S,[1 1 1],45);
>> Z2 = get(S,'zdata'); % Get the zdata after rotation.
>> isequal(Z,Z2)

ans =

0

Now you can do the same thing with xdata and ydata.

Matt Fig

Matt Fig (view profile)

on 15 Jun 2011

If I have answered your original question, please close this question out by accepting the answer (click the appropriate button). Thanks.

Sakshi

Sakshi (view profile)

on 15 Jun 2011

Thank you for your time and patience.

Matt Fig

Matt Fig (view profile)

Answer by Harsha Vardhan Rao Avunoori on 13 Jun 2011

You can generate an ellipsoid with the ellipsoid function and while plotting you can use the rotate() suggest by Matt.It should help you.

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