Interpolation: inverse of an ordinate


hml
05-28-2008, 03:33 AM
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,

hml
06-08-2008, 03:50 PM
No ideas out there?
rds,

hml
08-31-2008, 06:49 AM
I haven't found a way to do this better than what i said earlier,
Any ideas are highly appreciated,

regards,