Would you post this Mathematica question to news group for me, please?

*To*: <MathGroup at yoda.physics.unc.edu>*Subject*: Would you post this Mathematica question to news group for me, please?*From*: andrew at ll.mit.edu (Andrew Hecht)*Date*: Mon, 29 Jun 92 02:35:54 -0400

I have a problem with mathematica, version 2.0 (on NeXT): When I perform the following iteration using numbers with high precision, I get erroneous results. For example, with a = 3.750000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 and t = a/2 and using the following iteration technique: x = t; Do[Print[x]; x = a x - x^2 ,{140}] ; N[x,80] the results for the 135th through 140th iteration are 3.0, 2.0, 0.0, 0.0 I get the same result when the following technique is used: NestList[f, t , 140] , where f is the following: f[x_] = a x - x^2 Has any one out there encountered a similar problem or know of a solution? andrew hecht andrew at ll.mit.edu