On 4/27/12 7:18 PM, Debashish Saha wrote:
You will want to ask numpy questions on the numpy mailing list.
http://www.scipy.org/Mailing_Lists
When you do, I recommend stating a clear question in addition to the code and
the traceback (although those are very much appreciated). But just to get you on
your way, remove the np.vectorize() line (you don't need it) and double-check
the order of arguments that you are passing to delta_l(K,l).
from __future__ import division
from numpy import*
import numpy as np
import matplotlib.pyplot as plt
from scipy.special import jv
from scipy.special import yn
h_cross=1
m=1
E=np.linspace(0.1,10,100)
V0=-100
R=2
K=(2*E)**0.5
K_P=(2*(E-V0))**0.5
'''r=np.linspace(-10,10,1000)
def V(r):
if r>0 and r<R:
return V0
return 0
V=np.vectorize(V)
ax.set_ylim(-200,10)
plt.plot(r,V(r))'''
def sph_jv(l,r):
return (pi/(2*r))**0.5*jv(l+0.5,r)
def sph_yn(l,r):
return (pi/(2*r))**0.5*yn(l+0.5,r)
def delta_l(K,l):
return
arctan(((K_P*R)**2*sph_jv(l,K*R)-(2*l+3)*(K*R)*sph_jv(l+1,K*R))/((K_P*R)**2*sph_yn(l,K*R)-(2*l+3)*(K*R)*sph_yn(l+1,K*R)))
l=6
delta_l=np.vectorize(delta_l)
plt.plot(K,delta_l(l,K))
plt.show()
ValueError Traceback (most recent call last)
C:\Python27\lib\site-packages\IPython\utils\py3compat.pyc in
execfile(fname, glob, loc)
166 else:
167 filename = fname
--> 168 exec compile(scripttext, filename, 'exec') in glob, loc
169 else:
170 def execfile(fname, *where):
C:\Users\Neeraj\Desktop\14.py in<module>()
45 l=6
46 delta_l=np.vectorize(delta_l)
---> 47 plt.plot(K,delta_l(l,K))
48
49 display(gcf())
C:\Python27\lib\site-packages\numpy\lib\function_base.pyc in
__call__(self, *args)
1880 if self.nout == 1:
1881 _res = array(self.ufunc(*newargs),copy=False,
-> 1882 subok=True,dtype=self.otypes[0])
1883 else:
1884 _res = tuple([array(x,copy=False,subok=True,dtype=c) \
ValueError: setting an array element with a sequence.
--
Robert Kern
"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco
--
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