
Re: Help with formula (revised question)
Posted:
Nov 20, 2013 7:38 AM


Robert Crandal wrote: > I asked a similar question earlier. Thank you > everyone who tried helping. However, I'd now > like to revise the data and requirements. > Here is the new data set: > > X Y >   > 0.0 1 > 0.1 1 > 0.5 1 > 0.9 1 > 1.0 1 > 1.03 2 > 1.5 2 > 1.8 2 > 2.0 2 > 2.3 3 > 3.0 3 > 3.2 4 > > X is a positive real number greater than or equal > to zero (or 0.0). Y is an integer as seen in the > second column above. > > Can this data be represented with a formula > that only uses either addition, subtraction, > multiplication, division, modulus, or the power (^) > function, or any combination of these?
Yes! Use Lagrange's interpolation formula as referred to in my post of 18/11/2013 18:56 (GMT, presumably) in your thread 'Help with creating a function'. The resulting function is a polynomial and can be found whenever there are a finite number of X's each with just one corresponding Y.
 Madam Life's a piece in bloom, Death goes dogging everywhere: She's the tenant of the room, He's the ruffian on the stair.

