#13840: IntegerListsLex speedup
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Reporter: tscrim | Owner: sage-combinat
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.7
Component: combinatorics | Resolution:
Keywords: optimization, integerlistlex | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Travis Scrimshaw | Merged in:
Dependencies: #14045 | Stopgaps:
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Changes (by tscrim):
* dependencies: => #14045
Old description:
> This patch speeds up `IntegerListsLex` by removing calls to sage's
> `infinity` and has `max_slope` and `min_slope` set to `None` and has
> `max_part` default to `float(infinity)`.
>
> Before the patch:
> {{{
> sage: time p = Partitions(150, max_slope=-1, length=15).list()
> Time: CPU 14.04 s, Wall: 14.64 s
> }}}
> After:
> {{{
> sage: time p = Partitions(150, max_slope=-1, length=15).list()
> Time: CPU 2.86 s, Wall: 2.98 s
> }}}
New description:
This patch speeds up `IntegerListsLex` by removing calls to sage's
`infinity` and instead uses `float('+inf')` and `float('-inf')`.
Before the patch:
{{{
sage: time p = Partitions(150, max_slope=-1, length=15).list()
Time: CPU 14.04 s, Wall: 14.64 s
}}}
After:
{{{
sage: time p = Partitions(150, max_slope=-1, length=15).list()
Time: CPU 3.97 s, Wall: 4.14 s
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13840#comment:4>
Sage <http://www.sagemath.org>
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