[SciPy-user] modified bessel fn of second kind K(n,z)
r help
r_hlp at yahoo.com
Fri Apr 22 20:28:39 EDT 2005
hi
i am trying to use the modified bessel function of the
second kind, K_n(z)
K is called the mod. bes. fn of second kind on
mathworld;
K is called the mod. bes. fn of third kind in scipy.
the integer order function special.kn(-20,3) gives the
same result on both mathematica and scipy:
In [3]: special.kn(-20,3)
Out[3]: 16254643952204.371
however the real valued special.kv(-20,3) gives
different answers each time i call it:
In [2]: special.kv(-20,3)
Out[2]: -1.9924087524414062
In [4]: special.kv(-20,3)
Out[4]: 166558.53135225689
In [5]: special.kv(-20,3)
Out[5]: 166541.5313522513
In [6]: special.kv(-20,3)
Out[6]: 166541.53135221289
In [7]: special.kv(-20,3)
Out[7]: 166592.53135221568
In [8]: special.kv(-20,3)
Out[8]: 166541.5313522506
In [9]: special.kv(-20,3)
Out[9]: 166592.53135226108
In [10]: special.kv(-20,3)
Out[10]: 166541.53135219333
In [11]: special.kv(-20,3)
Out[11]: 166592.53135221079
In [19]: print scipy.scipy_version.scipy_version
0.3.2
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