Dear all

Hello

Can I ask one question about fitting?

I want to fit rotated hyperbolic pattern.

With unrotated hyperbolic pattern I just used TF1 and function which returns

par[1]*sqrt(1 + pow(x[0]/par[0],2));

However when the pattern is rotated of course I can’t simply use this function.

New function with rotation includes y^2, x^2, xy terms.

Is there any way to fit ‘rotated hyperbola’?

I tried to rotate this ‘rotated pattern’ again to make it looks like ‘unrotated pattern’ and fitted with simple function.

However then I don’t know how much should I rotate… I just decided the angle of rotation by my eyes.

I want to parameterize this angle too…

Thank you so much to think about it together!

Best Regards,

JungEun