ql.KrugerLogCubic(xArray,yArray)
double S(x[,boolExtrapolate]) returns the interpolated value at x. boolExtrapolate is switch to turn on extrapolation, default is no.
double S:derivative(x[,boolExtrapolate]) returns the numeric derivative at x
double S:secondDerivative(x[,boolExtrapolate]) returns the numeric second derivative at x
double S:primitive(x[,boolExtrapolate]) returns the numeric primitive at x
Creates a QuantLib object