Here's another worrying behaviour: sage: solve(log(x) == 0.5000000000000000000000000000000000001, x) [x == sqrt(e)]
On Monday, 11 June 2012 17:53:17 UTC-7, Eviatar wrote: > > It seems Maxima does this by default. Any way to disable it? > > On Monday, 11 June 2012 17:47:09 UTC-7, Eviatar wrote: >> >> solve has inconsistent behaviour when using exact numerical >> representations of numbers. >> >> For example: >> >> sage: solve(sin(x) == 0.5, x) >> [x == 1/6*pi] >> sage: arcsin(0.5) >> 0.523598775598299 >> >> sage: solve(log(x) == 0.5, x) >> [x == sqrt(e)] >> sage: e^0.5 >> 1.64872127070013 >> >> Shouldn't this be consistent? It seems to me that returning >> approximations makes more sense, because that's what all the functions do. >> > > On Monday, 11 June 2012 17:47:09 UTC-7, Eviatar wrote: >> >> solve has inconsistent behaviour when using exact numerical >> representations of numbers. >> >> For example: >> >> sage: solve(sin(x) == 0.5, x) >> [x == 1/6*pi] >> sage: arcsin(0.5) >> 0.523598775598299 >> >> sage: solve(log(x) == 0.5, x) >> [x == sqrt(e)] >> sage: e^0.5 >> 1.64872127070013 >> >> Shouldn't this be consistent? It seems to me that returning >> approximations makes more sense, because that's what all the functions do. >> > -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
