dt wrote:
> Hi All,
> I'm new to sage.  I'm very impressed and a bit overwhelmed at the
> capabilities in sage.  I noticed a discrepancy today that I can't
> reconcile in the response of bessel functions.  I get different values
> depending on how I invoke it.  For example, the bessel J functions
> don't have zeros!  
>   

Here are some J-Bessel function plots:

sage: f = lambda x: bessel_J(x,3,'maxima')
sage: P= plot(f,0,10)
sage: show(P)
sage: f = lambda x: bessel_J(x,5,'maxima')
sage: P= plot(f,0,10)
sage: show(P)
sage: f = lambda x: bessel_J(x,10,'maxima')
sage: P= plot(f,0,10)
sage: show(P)
sage: f = lambda x: bessel_J(2,x,'maxima')
sage: P= plot(f,0,10)
sage: show(P)

As you see, they do indeed have zeros.

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