Not sure if there should be a class Function from which you inherit. I
would think PiecewiseFunctions should tie in with Sage's category
framework. There's
http://doc.sagemath.org/html/en/reference/categories/sage/categories/map.html#sage.categories.map.Map
On Thursday, November 8, 2018 at
Le 08/11/2018 à 11:37, Xavier Caruso a écrit :
By the way, I noticed that there is no particular support for real
valued functions in Sage (except if I missed something). At least
End(RR) returns the "Set of*Homomorphisms* from Real Field ... to
Real Field ...". Shouldn't we implement this?
Le lundi 5 novembre 2018, Vincent Delecroix a écrit :
> If you want to support composition of functions then you want to be
> able to take images of "nice sets" by "nice maps". In other words,
> you need a theory that supports quantifier elimination (see e.g. [1]).
> In the situation discussed by
Le 05/11/2018 à 19:30, Michael Orlitzky a écrit :
On 11/05/2018 07:26 AM, Xavier Caruso wrote:
Hello,
...
So IMHO, it makes sense (and it would be easier to review) to have two
separated tickets, one for univariate functions and one for multivariate
functions. Don't you agree?
I think the
On 11/05/2018 07:26 AM, Xavier Caruso wrote:
> Hello,
> ...
>
> So IMHO, it makes sense (and it would be easier to review) to have two
> separated tickets, one for univariate functions and one for multivariate
> functions. Don't you agree?
I think the right design for piecewise functions is to
Hello,
(Sorry for replying so late...)
Le vendredi 26 octobre 2018, Matthias Koeppe a écrit :
> Though it sounds like you only need piecewise functions of a single
> real variable, I would suggest to make the ticket for piecewise linear
> (or polynomial) functions of several variables.
While
Though it sounds like you only need piecewise functions of a single real
variable, I would suggest to make the ticket for piecewise linear (or
polynomial) functions of several variables.
The current implementation of piecewise in Sage is tied to the general
symbolics in the symbolic ring.
Le vendredi 19 octobre 2018, Matthias Koeppe a écrit :
> Ticket (for piecewise linear functions, polyhedral domains) at
> https://trac.sagemath.org/ticket/26512
Thanks for opening this ticket.
I went through your code.
I guess that what I need is essentialy the classes "FastLinearFunction"
and
Ticket (for piecewise linear functions, polyhedral domains)
at https://trac.sagemath.org/ticket/26512
On Friday, October 19, 2018 at 4:00:53 AM UTC-5, Dima Pasechnik wrote:
>
> On Fri, Oct 19, 2018 at 4:08 AM Matthias Koeppe
> > wrote:
> >
> > Xavier,
> >
> > For code for piecewise linear
On 10/19/2018 06:20 AM, Samuel Lelievre wrote:
> Thanks Xavier for bringing this up.
>
> Piecewise-defined functions do need work in Sage.
>
> Related tickets and discussions:
>
> ...
>
I can add to that list (the SEP is probably outdated now):
Thanks Xavier for bringing this up.
Piecewise-defined functions do need work in Sage.
Related tickets and discussions:
https://trac.sagemath.org/query?order=id=1=~piecewise
https://trac.sagemath.org/wiki/symbolics#limitationsofPiecewisefunctions
Matthias, Xavier,
Having piecwise affine function of [0,1] would be cool for
implementing the Thomson group!
For higher dimensional functions it is much more subtle (a 1-dim
polytope is just an interval). Though, I am +1 on having in mind
that this has to be extended to more variables.
Best
On Fri, Oct 19, 2018 at 4:08 AM Matthias Koeppe
wrote:
>
> Xavier,
>
> For code for piecewise linear functions of several variables, see here:
> https://github.com/mkoeppe/cutgeneratingfunctionology/blob/master/piecewise_functions.sage
> I'd be quite interested in getting something like this
Xavier,
For code for piecewise linear functions of several variables, see
here:
https://github.com/mkoeppe/cutgeneratingfunctionology/blob/master/piecewise_functions.sage
I'd be quite interested in getting something like this into sage. There's
no ticket for this yet.
Also, you might be
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