I am trying to numerically evaluate the integral of bessel functions.
I've tried constructing it various ways. The one that makes most
sense to me is:
a=var('a')
f=bessel_J(1,a)*bessel_J(0,0.1*a)*e^(-5*a)
f.numerical_integral(a,0,infinity)
I get the error: Cannot evaluate symbolic expression to a numeric
value.
I also tried placing various arguments inside n() functions. Then I
get the error: self must be a numeric expression
Obviously, if I don't have a variable in my expression, I wouldn't
need Sage to help me integrate it. I get the same errors with
nintegral() instead of numerical_integral().
How do I construct this to get a numeric result?
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