Status: New
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 3298 by [email protected]: integrate / limit does not know the
sign of abs() / does nor catch NotImplementedError from limit()
http://code.google.com/p/sympy/issues/detail?id=3298
x=Symbol("x")
f1=2*E**(-2*x)
F1=integrate(f1,(x,0,oo))
print F1 #Works great.
a=Symbol("a")
f2=abs(a)*E**(-abs(a)*x)
F2=integrate(f2,(x,0,oo)) #fails
and the output is:
Traceback (most recent call last):
File "C:/Users/Barak/Desktop/python/temp", line 18, in <module>
F2=integrate(f2,(x,0,oo))
File "C:\Python27\lib\site-packages\sympy\utilities\decorator.py", line
24, in threaded_func
return func(expr, *args, **kwargs)
File "C:\Python27\lib\site-packages\sympy\integrals\integrals.py", line
847, in integrate
return integral.doit(deep = False)
File "C:\Python27\lib\site-packages\sympy\integrals\integrals.py", line
393, in doit
function = antideriv._eval_interval(x, a, b)
File "C:\Python27\lib\site-packages\sympy\core\expr.py", line 229, in
_eval_interval
B = limit(self, x, b)
File "C:\Python27\lib\site-packages\sympy\series\limits.py", line 116, in
limit
return i*limit(d, z, z0, dir)
File "C:\Python27\lib\site-packages\sympy\series\limits.py", line 192, in
limit
r = gruntz(e, z, z0, dir)
File "C:\Python27\lib\site-packages\sympy\series\gruntz.py", line 678, in
gruntz
r = limitinf(e, z)
File "C:\Python27\lib\site-packages\sympy\core\cache.py", line 101, in
wrapper
func_cache_it_cache[k] = r = func(*args, **kw_args)
File "C:\Python27\lib\site-packages\sympy\series\gruntz.py", line 480, in
limitinf
c0, e0 = mrv_leadterm(e, x)
File "C:\Python27\lib\site-packages\sympy\core\cache.py", line 101, in
wrapper
func_cache_it_cache[k] = r = func(*args, **kw_args)
File "C:\Python27\lib\site-packages\sympy\series\gruntz.py", line 562, in
mrv_leadterm
f, logw = rewrite(exps, Omega, x, w)
File "C:\Python27\lib\site-packages\sympy\series\gruntz.py", line 627, in
rewrite
raise NotImplementedError('Result depends on the sign of %s' % sig)
NotImplementedError: Result depends on the sign of -sign(Abs(a))
The discussion link:
https://groups.google.com/d/topic/sympy/3-EtDPKMWlE/discussion
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