Comment #16 on issue 3090 by nathan.f...@gmail.com: Create
ContinuousDensity class
http://code.google.com/p/sympy/issues/detail?id=3090
Hmm... I see.
Maybe you can convert a dict to a Piecewise?
{1: 1/2, 0: 1/2} -> Piecewise((1/2, Eq(x, 1)), (1/2, Eq(x, 0)), (0, True)).
But that is very cumbersome. I'm stuck on a good basis to make different
kinds of representations for continuous and finite rvs: a lambda-like
representation for continuous, and a dictionary-like representation for
finite. Ideas so far:
-ProbabilityFunction subclasses Lambda, but MassFunction (for finite)
overrides it with a dict-like printing
-ProbabilityFunction doesn't subclass Lambda and has abstract functions for
checking normality. There are implemented in the subclasses
DensityFunction, which also subclasses Lambda, and MassFunction, which
subclasses dict (or has dict-like properties and representation).
-Add a Dict object to sympy to represent a finite mapping of symbols (which
I think can have other applications). MassFunction will subclass this new
type of object.
Extensions:
-Infinite discrete rv's (Countable) would use Lambdas, with the extra
specification that inputs must be integers.
-Multivariate rv's would be multivariate Lambda functions: /\((x, y),
x**2+y**2).
--
You received this message because you are subscribed to the Google Groups
"sympy-issues" group.
To post to this group, send email to sympy-issues@googlegroups.com.
To unsubscribe from this group, send email to
sympy-issues+unsubscr...@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/sympy-issues?hl=en.
