how to plot ellipse in this format?

Question

I would like to ask how to plot ellipse in such format:

ax^2+by^2+cxy+dx+ey-1=0

I tried with ezplot and contour and it didn't seem to work.

I would suggest checking out this related/potential duplicate question: http://stackoverflow.com/questions/2153768/matlab-to-draw-ellipse-and-ellipsoid — gnovice, May 17 '10 at 14:05

score 0 · Answer 1 · answered May 17 '10 at 07:59

0

If you use that equation you must satisfy the relation c^2 - 4ab < 0 for it to be an ellipse.

Edit: Also specifying more clearly how it does not seem to work (what you were expecting and what happened) could be useful.

answered May 17 '10 at 07:59

score 0 · Answer 2 · answered May 17 '10 at 11:04

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You need to use numeric values for the parameters a through e. Then you can plot the ellipse with ezplot.

answered May 17 '10 at 11:04

Jonas

score 0 · Answer 3 · answered May 17 '10 at 16:25

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see this file on the matlab file exchange: ellipse.m

answered May 17 '10 at 16:25

Marc

3 Answers3