Hi Jason, On Sat, 02 Jan 2010 15:14:15 -0700 Jason Grout <jason-s...@creativetrax.com> wrote:
> Here is the problem, narrowed down a bit: > > > sage: log(SR(float(-7.0))) > Traceback (most recent call last): > ... > ValueError: math domain error > sage: log(float(-7.0)) > 1.94591014906 + 3.14159265359*I > sage: log(RR(-7.0)) > 1.94591014905531 + 3.14159265358979*I > sage: log(SR(-7)) > I*pi + log(7) > sage: log(SR(-7.0)) > 1.94591014905531 + 3.14159265358979*I > > > Note the first answer, a symbolic-wrapped float, gave a domain error. > Is that version calling some C library that doesn't deal with complex > numbers? The floating point numbers in this problem appear because > we use hardware floats in plotting for speed. Many thanks for these examples. They were really helpful. > Burcin, do you see what is going on? Do you know how to fix it? With the patch at #7490, I changed pynac to call math.log() to evaluate logarithms when the argument is a float. This function raises the domain error we see on input <= 0, but I missed that. I attached a fix to #7822: http://trac.sagemath.org/sage_trac/ticket/7822 Cheers, Burcin -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
