Comment #14 on issue 1851 by [email protected]: Integral((-60*exp(x) -
19.2*exp(4*x))*exp(4*x), x).doit() extremely slow
http://code.google.com/p/sympy/issues/detail?id=1851
Perhaps it's faster now
t=time();Integral((-60*exp(x) - 19.2*exp(4*x))*exp(4*x), x).doit()
-2.4*exp(8*x) - 12.0*exp(5*x)
time()-t
21.469109058380127
But
risch_integrate((-60*exp(x) - 19.2*exp(4*x))*exp(4*x), x)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'risch_integrate' is not defined
from sympy.integrals.risch import *
risch_integrate((-60*exp(x) - 19.2*exp(4*x))*exp(4*x), x)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "sympy/integrals/risch.py", line 1524, in risch_integrate
ans, i, b = integrate_hyperexponential(fa, fd, DE)
File "sympy/integrals/risch.py", line 1284, in integrate_hyperexponential
pp = as_poly_1t(p, DE.t, z)
File "sympy/integrals/risch.py", line 758, in as_poly_1t
raise NotImplementedError(e)
NotImplementedError: there is no field associated with RR
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