On Jan 29, 2009, at 11:51 AM, Robert Close wrote:
> I'm trying to do some symbolic calculus and am having trouble with
> the special function spherical_bessel_J(). I can't get it to work
> when the argument contains two factors.
> Here is a simple program:
> k=var('k');
> k=maxima(k);
> rho=var('rho');
> rho=maxima(rho);
> arg=var('arg');
> arg=maxima(arg);
> arg=k*rho;
> f=cos(arg);
> print f;
> f=spherical_bessel_J(1,rho);
> print f;
> f=spherical_bessel_J(1,arg);
> print f;
>
> The first two print statements are fine:
>
> cos(k rho)
>
> sin(rho)
> -------- - cos(rho)
> rho
> -------------------
> rho
> But the program hangs and never reaches the third print statement.
> What is wrong?
I'm not sure, looks like some pexpect issue. However, this works fine:
sage: arg = var('arg')
sage: f = spherical_bessel_J(1,var('arg')); f
(sin(arg)/arg - cos(arg))/arg
sage: print f
sin(arg)
-------- - cos(arg)
arg
-------------------
arg
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