Status: Accepted
Owner: mrock...@gmail.com
CC: nathan.f...@gmail.com
Labels: Type-Defect Priority-Medium Statistics
New issue 3090 by mrock...@gmail.com: Create ContinuousDensity class
http://code.google.com/p/sympy/issues/detail?id=3090
Currently densities of continuous random expressions are represented as a
tuple of (variable, density) where variable is the active/free variable in
the density expression. This representation is a bit unintuitive and should
be replaced with something like a function
Currently
x, density = Density(expr)
print "Probability density at 3: ", density.subs(x, 3)
We would like to have
pdf = Density(expr)
print "Probability density at 3: ", pdf(3)
There is a current class, Lambda that can do this fairly well.
Alternatively we may want to subclass something so that we can add
additional functionality. In particular
1) cleaner printing
2) verification that the pdf integrates to 1
Because this is a change to the interface it would be good to get this in
before the next release cycle.
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