[SciPy-dev] some interesting routines in Python SOMNEC program
eric
eric at scipy.org
Wed Feb 13 14:26:24 CST 2002
> Actually, they are exposed. Are they not working on your platform?
Hmmm. Yes. Now I see that they are. I had done a grep for zbesh, and it didn't
show up in the methods table, so I assumed none of them were there. Now I see
the cbesh entries. Should we add the double complex versions?
> The derivatives of any bessel function satisfy the recurrence relation:
>
> d C_v(z)
> ------- = ( C_(v-1) (z) - C_(v+1) (z) ) / 2
> dz
>
> = C_(v-1) (z) - v / z * C_v(z)
>
> = -C_(v+1) (z) + v / z * C_v(z)
>
>
> where C is any of the bessel functions or modified bessel functions or any
> linear combination of them.
>
> (From Abramowitz and Stegun pg. 361)
You had to look it up in a book? <wink>
> We could easily implement these derivatives if it is desired.
It might be. we discuss this when we have a discussion about renaming the
functions in special...
see ya,
eric
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