#9130: Access to beta function
---------------------------+------------------------------------------------
Reporter: kcrisman | Owner: burcin
Type: enhancement | Status: new
Priority: major | Milestone: sage-5.0
Component: symbolics | Keywords: special function, pynac
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
---------------------------+------------------------------------------------
Although Maxima has the beta function, Sage doesn't:
{{{
sage: a, b, c = var('a b c')
sage: assume(a > 0)
sage: assume(b > 0)
sage: x = var('x')
sage: beta_dist = x**(a-1) * (1 - x)**(b-1)
sage: c = integral(beta_dist, x, 0, 1)
sage: c
beta(a, b)
sage: c(a=.5,b=.5)
beta(0.500000000000000, 0.500000000000000)
sage: c(a=.5,b=.5).n()
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
/Users/karl-dietercrisman/<ipython console> in <module>()
/Users/karl-dietercrisman/Desktop/sage-4.4.2/local/lib/python2.6/site-
packages/sage/symbolic/expression.so in
sage.symbolic.expression.Expression.n
(sage/symbolic/expression.cpp:17042)()
TypeError: cannot evaluate symbolic expression numerically
}}}
This *is* is Ginac, though, and there is even room for defining it in
symbolic/expression.pyx . It probably is also included in some of our
other libraries, as a standard special function.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9130>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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