ASKSAGE: Sage Q&A Forum - Latest question feedhttp://ask.sagemath.org/questions/Q&A Forum for SageenCopyright Sage, 2010. Some rights reserved under creative commons license.Sun, 05 Jun 2011 05:26:22 -0500summing over bessel functionhttp://ask.sagemath.org/question/8148/summing-over-bessel-function/Hi.
I need to sum over a bessel function K:
sum(bessel_K(0,2*PI*abs(x+k)),k,-oo,oo)
How ever I get an error:
>TypeError: Cannot evaluate symbolic expression to a numeric value.
Which sounds logical. I there any way around this?
Thanksyotama9Sun, 05 Jun 2011 05:26:22 -0500http://ask.sagemath.org/question/8148/Symbolic expressions and simplifyinghttp://ask.sagemath.org/question/7852/symbolic-expressions-and-simplifying/I asked this on IRC, but no-one seemed to be on there.
I had a quick question concerning simplifying a symbolic expression in sage.
Basically, when i do a Laplace transform, i end up with the RHS of the following equation, but I would like to see the LHS of the equation
http://upload.wikimedia.org/math/a/1/7/a1752ef3bbff0288217159ca274c5bc8.png
Would anyone know how to change from one side to the other side please?
CoolHanDrewSat, 08 Jan 2011 00:22:02 -0600http://ask.sagemath.org/question/7852/Bessel functionshttp://ask.sagemath.org/question/7878/bessel-functions/A couple of questions about Bessel functions:
(1) Shouldn't this return return a symbolic expression, so that it can be used as part of an expression to be evaluated later with a specific r:<pre>
sage: var('r')
sage: bessel_J(0,r)
</pre>
I'm thinking specifically of building up a series that will later be plotted.
(2) There was talk a while back about making the zeros of the Bessel functions available without having to calculate them with find_root() (Not that there's a problem doing that, but it would just be a convenience.) I was just wondering if anything came of that.
Mike WittSun, 16 Jan 2011 09:44:24 -0600http://ask.sagemath.org/question/7878/