Hello,
In the chapter about polynomial interpolation, how can one use the algorithm, so that given an ordinate y, one can get the first abscissa x such that f(x)=y using the polynomial?
Obtain the interpolating polynomial coefficients first, and then use Newton-raphson root finding algo? Or is there a more inherent way?

Same for cubic splines?

rds,

No ideas out there?
rds,

I haven't found a way to do this better than what i said earlier,
Any ideas are highly appreciated,

regards,