#3955: make find_minimum_on_interval use _fast_float_
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Reporter: was | Owner: burcin
Type: enhancement | Status: positive_review
Priority: major | Milestone: sage-5.6
Component: calculus | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers: Timo Kluck
Authors: Andrzej Giniewicz | Merged in:
Dependencies: #2607 | Stopgaps:
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Description changed by jdemeyer:
Old description:
> {{{
>
> On Tue, Aug 26, 2008 at 2:07 AM, Stan Schymanski <[email protected]>
> wrote:
> >
> > Dear William,
> >
> > On Aug 25, 6:48 pm, "William Stein" <[email protected]> wrote:
> >
> >> If you call _fast_float_ as illustrated below on your functions,
> find_* will
> >> work, and also be much much faster:
> >>
> >> sage: find_maximum_on_interval((-x^2)._fast_float_(x),-1,1)
> >> (-7.7037197775489434e-34, -2.77555756156e-17)
> >> sage: find_minimum_on_interval((-x^2)._fast_float_(x),-1,1)
> >> (-0.99999992595132459, -0.999999962976)
> >>
> >> find_* doesn't do this already since (1) _fast_float_ was written
> >> after find_*, and (2) nobody has had the time to change find_*
> >> to use _fast_float_.
> >
> > That's amazing, thank you! I didn't find any information about the
> > _fast_float_. Can it be used for other purposes, too?
>
> Yes. It takes any polynomial or symbolic expression and turns
> it into a very fast callable function that has input and output floats.
> It should get used automatically by functions like find_min* but
> we haven't pushed this through enough yet.
> }}}
>
> '''Apply:'''
> * [attachment:trac3955-find_local_maximum-ff.patch]
New description:
{{{
On Tue, Aug 26, 2008 at 2:07 AM, Stan Schymanski <[email protected]>
wrote:
>
> Dear William,
>
> On Aug 25, 6:48 pm, "William Stein" <[email protected]> wrote:
>
>> If you call _fast_float_ as illustrated below on your functions, find_*
will
>> work, and also be much much faster:
>>
>> sage: find_maximum_on_interval((-x^2)._fast_float_(x),-1,1)
>> (-7.7037197775489434e-34, -2.77555756156e-17)
>> sage: find_minimum_on_interval((-x^2)._fast_float_(x),-1,1)
>> (-0.99999992595132459, -0.999999962976)
>>
>> find_* doesn't do this already since (1) _fast_float_ was written
>> after find_*, and (2) nobody has had the time to change find_*
>> to use _fast_float_.
>
> That's amazing, thank you! I didn't find any information about the
> _fast_float_. Can it be used for other purposes, too?
Yes. It takes any polynomial or symbolic expression and turns
it into a very fast callable function that has input and output floats.
It should get used automatically by functions like find_min* but
we haven't pushed this through enough yet.
}}}
'''Apply:'''
* [attachment:trac3955-find_local_maximum-ff.2.patch]
--
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/3955#comment:18>
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