SetSystem

[Gordon]

How do I access the SetSystem class that Rudi built from within Sage?

I want to use it to represent clutters...

Gordon

[Michael Welsh]

On 5/12/2013, at 1924, Gordon <gordon...@gmail.com> wrote:
>
> How do I access the SetSystem class that Rudi built from within Sage?

Does
from sage.matroids.set_system import *
work?

[Gordon Royle]

Yes, it does. Thanks.

I'm sure its easy if you know how, but what is the recommended way to find out for myself where things are located within Sage? (I could not locate it by typing "SetSystem" into the Sage documentation page)

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[Michael Welsh]

On 5/12/2013, at 1931, Gordon Royle <gordon...@gmail.com> wrote:
>
> I'm sure its easy if you know how, but what is the recommended way to find out for myself where things are located within Sage? (I could not locate it by typing "SetSystem" into the Sage documentation page)

I just looked at the sage-matroid source code. It's the best way to find undocumented functions.

[Stefan van Zwam]

In this particular case, it's undocumented on purpose, because we consider it an internal data type, and reserve the right to change it without notice. Because of this, and because we want it to be fast,

1) Most methods are cdef, so they are only accessible if you write Cython code and cimport the class

2) The cpdef methods are underscored, so by default Sage autocomplete does not print them.  

I think it would be great if Sage had a proper SetSystem class, but it'll take a lot of work to turn our class into something like that.

--Stefan.

[Rob Beezer]

On 12/04/2013 11:05 PM, Michael Welsh wrote:
> I just looked at the sage-matroid source code. It's the best way to find undocumented functions.
>

And here is a great way to get started on that:

sage: search_src("SetSystem")
- returns about 100 different lines of code, with file names and line numbers

sage: search_def("SetSystem")
- returns about 25 lines of code, one of which is

matroids/set_system.pxd:3:cdef class SetSystem:

which is where I would start digging further.

Rob