Oh, and Sage with Python 3 is in pretty good shape these days. Still some doctest failures, but I think it is mostly very functional.
John On Thursday, June 6, 2019 at 3:20:25 PM UTC-7, John H Palmieri wrote: > > I can confirm that it works for me on OS X with Python 3, gives the error > you described with Python 2. > > > On Thursday, June 6, 2019 at 2:57:08 PM UTC-7, Emmanuel Charpentier wrote: >> >> According to Serge Lelièvre, the proble doesn't occur when ran under a >> Python3-based Sage. He advises to run such a Sage, hich seems a bit early, >> IMHO? >> >> Advice ? >> >> >> Le jeudi 6 juin 2019 11:04:27 UTC+2, Emmanuel Charpentier a écrit : >>> >>> This ask.sagemath question >>> <https://ask.sagemath.org/question/46819/numerical-integration-and-plot-failing/> >>> seems >>> to raise a genuine bug. Perusing Trac doesn't raise muc relevant, possibly >>> except for Trac#24428 <https://trac.sagemath.org/ticket/24428> and >>> Trac#21754 <https://trac.sagemath.org/ticket/21754>. >>> >>> From my comment to the ask.sagemath question : >>> >>> Indeed : >>> sage: var("y,z") >>> (y, z) >>> sage: cauchy(z)=solve(z*y^3 +y^2 - 2*z*y+2 ,y)[0].rhs() >>> sage: def foo(u):return(arg(cauchy(u)).n()) >>> sage: [foo(t) for t in (1,1.1..2)] >>> [0.828222717321238, >>> ## Snip... >>> 0.377665318352514] >>> Therefore, this function *can* be evaluated. But : >>> sage: plot(foo,(1,2)) >>> verbose 0 (3635: plot.py, generate_plot_points) WARNING: When >>> plotting, failed to evaluate function at 200 points. >>> verbose 0 (3635: plot.py, generate_plot_points) Last error message: >>> 'negative number cannot be raised to a fractional power' >>> Launched png viewer for Graphics object consisting of 0 graphics >>> primitives >>> ... not in `plot`. Trying to plot symbolically yelds : >>> TypeError: Cannot evaluate symbolic expression to a numeric value. >>> A bug, IMHO. >>> >>> Can someone confirm this and, possibly, give me hints as how to flag >>> this ticket efficiently ? >>> >> -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at https://groups.google.com/group/sage-support. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-support/e0f7b7e2-1f85-46f3-bd12-b8ef02124ece%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
