29.03.2013 18:42, Pauli Virtanen kirjoitti: [clip] > To find zeros, interpolate y-vs-x instead of x-vs-y If there are multiple roots, you can use splines: http://docs.scipy.org/doc/scipy/reference/generated/scipy.interpolate.InterpolatedUnivariateSpline.html See the roots() method. -- Pauli Virtanen