#13922: Avoid a regression in the creation of homsets
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Reporter: SimonKing | Owner: tbd
Type: defect | Status: new
Priority: critical | Milestone: sage-5.6
Component: performance | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: #715 | Stopgaps:
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Comment (by vbraun):
I take it that whenever you write `pi/2` we first see if that can be
simplified to just the numerator. Which requires a gcd, and #13014 changed
gcd of symbolics to be more expensive.
Really the example is very poor, a python function returning a symbolic
expression. If you just had a symbolic function then the `fast_callable`
trickery could do its job. Just leave out the `lambda t:` and it is >100
times faster!
{{{
sage: var('t')
t
sage: %time p =
polar_plot((100/(100+(t-pi/2)^8))*(2-sin(7*t)-cos(30*t)/2), -pi/4, 3*pi/2,
color="red",plot_points=1000)
CPU times: user 0.04 s, sys: 0.00 s, total: 0.04 s
Wall time: 0.05 s
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13922#comment:3>
Sage <http://www.sagemath.org>
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