Comment #15 on issue 2128 by asmeurer: cannot integrate piecewise function
numerically
http://code.google.com/p/sympy/issues/detail?id=2128
Maple can do it:
p:=piecewise(x - y < 0, 1, 0);
p := / 1 x - y < 0
{
\ 0 otherwise
integrate(p, y);
/ 0 y <= x
{
\ -x + y x < y
integrate(p, y=-infinity..infinity);
infinity
I'm not entirely sure what's going on, but it's clear that it can be done.
Anyway, even if we keep that error, the message needs to be improved. It
isn't clear at all what sym is referring to. Better would be to use %s and
put the part of the expression itself in the message. Also, it should use
NotImplementedError(message) style syntax.
Feel free to implement something that lets you only do a subs in the main
part of the piecewise, though are you sure that that is indeed
mathematically what you want?
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