Right, I typed it incorrectly. But if I type R.<t> = RDF['t'] the result is the same.
Bill. On 4 Nov, 03:43, "William Stein" <[EMAIL PROTECTED]> wrote: > On Mon, Nov 3, 2008 at 7:06 PM, Bill Hart <[EMAIL PROTECTED]> wrote: > > > sage: R.<x>=RDF['t'] > > This first line is wrong. It should be > > R.<t> = RDF[] > > or > > R.<t> = PolynomialRing(RDF) > > or > > R.<t> = RDF['t'] > > As is, you've made the polynomial ring that prints its > variable as t but is referred to as x. Here's something similar. > > age: R.<x> = QQ['t'] > sage: x > t > > Who knows what you defined the t to be that you're using above? > I don't. > > William > > > sage: s=1.0e1*t^3+1.0e-100*t^2+1.01234e-100*t+1.0e1 > > sage: u=1.0e1*t^3-1.0e1*t^2+1.0e1*t-1.0e1 > > sage: s*u > > 100.0*t^6 - 100.0*t^5 + 100.0*t^4 - 100.0*t^2 + 100.0*t - 100.0 > > > What happened to the t^3 term? > > > Bill. > > -- > William Stein > Associate Professor of Mathematics > University of Washingtonhttp://wstein.org --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
