#13559: loglog plots of "large" function fail to find good evaluation points
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Reporter: nthiery | Owner: jason, was
Type: defect | Status: new
Priority: major | Milestone: sage-5.5
Component: graphics | Resolution:
Keywords: agregation | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
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Comment (by ppurka):
In fact, I just realized why you are getting the errors. The problem is
with `fast_float`.
{{{
sage: set_verbose(1)
sage: p = plot_loglog(exp(x), (1, 10^5), plot_points=2)
verbose 1 (2397: plot.py, generate_plot_points)
Unable to compute f(100000.0) (time = 19.237264)
sage: exp(100000.0).n()
2.80666336042612e43429
sage: from sage.ext.fast_eval import fast_float
sage: f(x) = exp(x)
sage: v = f.variables()
sage: F = fast_float(f, *v)
sage: F(100000.0)
inf
}}}
Maybe you are better off generating the list of data points by using exact
arithmetic in Sage and then passing off the list to `list_plot`.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13559#comment:7>
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