Assymetric ellipse


Just moved this from root support because it is probably more of a math tool question.

I have two variables which come from a fit, and I am trying to plot the 2D contour of their measures along with the correlation.
Just for the statistical error part I have found at least three solutions: minuit->Contour, RooEllipse and a normal TEllipse in which I define the properties by hand.

The problem is that I have also a systematic (assymetric) error in each measurement, and this errors also may have a different correlation between them, and this error comes from a different program plus literature, so I have to put it by hand.

So, is there any predefined way to do this (assymetric ellipse contour with parameters defined by hand), and if not does anyone know what would be the best way to implement it? I have been trying to do 4 different TEllipse each spanning 90 degrees but this approach doesn’t work because the contour line is not continuous at the junctions


TEllipse is always symmetrical. You will need to compute the X Y vectors yourself and Draw a TGraph with them if you need an asymmetric ellipse.