I would like to fit a set of xy points to a general conic equation of the form:
ax^2 + bxy + cy^2 +dx + ey + f = 0
where I need to constrain the coefficient "c" to zero. So I would like to fit:
ax^2 + bxy +dx + ey + f = 0
to determine the values of the coefficients.
I have tried:
but I cannot determine how to contrain the coefficient. It gives me a good fit, but the coefficient "c" is non-zero. The fit is not good if I plot it with the "c" coefficient set to zero.