On Saturday, March 1, 2014 6:59:30 PM UTC-5, David Joyner wrote: > > On Sat, Mar 1, 2014 at 6:30 PM, Jorge Garcia <calc...@aol.com<javascript:>> > wrote: > > Hello everyone, > > > > I ran into the following 2 issues regarding a power regression. Can > someone > > shed some light on this? > > > > (1) > > I'm trying to solve(f(x)==100,x) at the end of this worksheet. Why > doesn't > > the last cell work, but the next to last cell works fine? > > https://sage.math.clemson.edu:34567/home/pub/606/ > > > > (2) >
I'm pretty sure it's because there are zillions of significant digits and Maxima doesn't like that. It wants to interpret this as a symbolic thing to the crazy 1994xytz/100000000 or whatever power, and that is something it takes time with. Try solving solve(x^1.9==100,x) and note that even this takes a bit, and 1.99 takes longer. And sage: len(solve(x^1.99==100,x)) 199 Which makes sense - 199 199th roots of unity, in essence! Now do you see why it takes so long? :-) But numerical solvers should do just fine, since only one or two will be real in any given case. -- You received this message because you are subscribed to the Google Groups "sage-edu" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-edu+unsubscr...@googlegroups.com. To post to this group, send email to sage-edu@googlegroups.com. Visit this group at http://groups.google.com/group/sage-edu. For more options, visit https://groups.google.com/groups/opt_out.
