R help - Jun 2012 - ellipse

Hi, 
I would like to draw elliptic confidence interval. I know I can use a
package ellpise, but can I do it in this way:

I want to draw an ellipse countour i.e. all points in R^2 such that
t(x*-x)%*%A%*%(x*-x)<=c, for some x* in R^2 and constant c. A is 2x2 matrix.

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