You can more easily check the accuracy of log by using floats that are representable exactly in binary. like 1, 0.5, 0.25, ... if that is your objective.
0.1 read in and converted to a nearby binary double float number is approximately 1.000000000000000055511151231257827021181583404541e-1 For your information, in Mathematica one can get extra precision by adding enough zeros (more than 16 or so) and in my opinion the design of the significance arithmetic there is deeply flawed. I hope that Sage and sympy do not take Mathematica as a guide for what the user should see. RJF -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
