#2452: [with patch, needs review] Heaviside step function, Dirac delta needed
-------------------------+--------------------------------------------------
Reporter: gfurnish | Owner: gfurnish
Type: enhancement | Status: assigned
Priority: critical | Milestone: sage-4.1
Component: symbolics | Keywords:
Reviewer: | Author:
Merged: |
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Comment(by wdj):
The testing didn't reveal any failures related to the patch. However, I'm
also wondering about
this output:
{{{
sage: f(x) = heaviside(x)+dirac_delta(x)
sage: f(1)
dirac_delta(1) + heaviside(1)
sage: f = heaviside+dirac_delta
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
/home/wdj/.sage/temp/hera/14949/_home_wdj__sage_init_sage_0.py in
<module>()
TypeError: unsupported operand type(s) for +: 'FunctionHeaviside' and
'FunctionDiracDelta'
}}}
even though it has no problem evaluating them:
{{{
sage: heaviside(1); dirac_delta(1)
1
0
}}}
I don't see a problem with the integral methods but I'd prefer definite
integrals over indefinite ones.
In any case,
{{{
sage: dirac_delta.integral(0)
heaviside(0)
}}}
seems odd.
If you can address these comments I'd be happy to look at it again.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/2452#comment:9>
Sage <http://sagemath.org/>
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