Mario....that's it. The gamma function only wants integers. Thanks!
On Tue, Nov 12, 2013 at 3:29 AM, mario <[email protected]> wrote: > I get the same error message, using the development version; putting > instead > > shape = 4 > scale = 2 > > (not float) it does not give an error. > > > On Monday, November 11, 2013 10:05:07 PM UTC+1, Erin Hodgess wrote: >> >> Hello! >> >> I'm having a little trouble with some integration. >> >> My goal is to set up a cumulative distribution for some functions. The >> one below is my attempt at the gamma distribution. However, it does not >> like the integrate statement. >> >> >> >> >> >>> x, y, t = symbols('x y t') >> >>> shape = float(4.0) >> >>> scale = float(1.5) >> >>> z2 = (scale**shape)*gamma(shape) >> >>> y = ((x*(shape-1))*exp(-x/scale))/z2 >> >>> y >> 0.0987654320987654*x*exp(-0.666666666666667*x) >> >>> integrate(y,(x,0,t)) >> Traceback (most recent call last): >> File "<stdin>", line 1, in <module> >> File "/usr/local/lib/python2.7/dist-packages/sympy/utilities/decorator.py", >> line 30, in threaded_func >> return func(expr, *args, **kwargs) >> File "/usr/local/lib/python2.7/dist-packages/sympy/integrals/integrals.py", >> line 1626, in integrate >> risch=risch, manual=manual) >> >> Has anyone run into this before, please? >> >> Thanks in advance for any help. >> >> Sincerely, >> Erin >> >> >> -- > You received this message because you are subscribed to a topic in the > Google Groups "sympy" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/sympy/OF_TB9PZJYw/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/sympy. > For more options, visit https://groups.google.com/groups/opt_out. > -- Erin Hodgess Associate Professor Department of Computer and Mathematical Sciences University of Houston - Downtown mailto: [email protected] -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/sympy. For more options, visit https://groups.google.com/groups/opt_out.
