[Tutor] TypeError: can't multiply sequence by non-int of type 'float'

[Sayan Chatterjee]

Dear All,

I know this error occurs when one tries to multiply a string with a
fraction i.e float. In my case , I can't figure out how can a numpy
floating point array be a string.  Interestingly, the concerned expression
gets printed in the loop for the first time but on the second go it fails.

The concerned snippet of code is given below :

for t in t_range(0,1,0.1):
  print t
  p_za=[]
  pv_za=[]

  # Opening file in file_t format
  fname = 'file_' + str(t) + '.dat'
  fo = open(fname,'w')

  # p_za.append(p_initial - t*K*np.sin(K*p_initial))
  print 'K=',K
  print 'pv_za_temp =',pv_za_temp
  print '- t*K*np.sin(K*p_initial) = ',- t*K*np.sin(K*p_initial)
  print '-K*np.sin(K*pv_za_temp) = ',-K*np.sin(K*pv_za_temp)
  pv_za.append(-K*np.sin(K*pv_za_temp))
  pv_za_temp = []
  pv_za_temp.append(np.array(pv_za))


Here is paste the output,which clearly  shows that the concerned expression
i.e -K*np.sin(K*pv_za_temp) prints perfectly for the first looping. Also
see the error that comes on the second looping. I'm clueless.

0
K= 3.14159265359
pv_za_temp = [ 0.   0.5  1.   1.5  2. ]
- t*K*np.sin(K*p_initial) =  [ 0.  0. -0. -0.  0.]
*-K*np.sin(K*pv_za_temp) =  [ -0.00000000e+00  -3.14159265e+00
6.49753967e-13   3.14159265e+00*
*  -1.29950793e-12] PRINTS PERFECTLY*
*
*
0.1
K= 3.14159265359
pv_za_temp = [array([[ -0.00000000e+00,  -3.14159265e+00,   6.49753967e-13,
          3.14159265e+00,  -1.29950793e-12]])]
- t*K*np.sin(K*p_initial) =  [ -0.00000000e+00  -3.14159265e-01
6.49753967e-14   3.14159265e-01
  -1.29950793e-13]
-K*np.sin(K*pv_za_temp) = *ERROR*
Traceback (most recent call last):
  File "ZA.py", line 45, in <module>
    print '-K*np.sin(K*pv_za_temp) = ',-K*np.sin(K*pv_za_temp)
*TypeError: can't multiply sequence by non-int of type 'float'*

Please Help!!!!


Cheers,
Sayan


-- 


--------------------------------------------------------------------------
*Sayan  Chatterjee*
Dept. of Physics and Meteorology
IIT Kharagpur
Lal Bahadur Shastry Hall of Residence
Room AB 205
Mob: +91 9874513565
blog: www.blissprofound.blogspot.com

Volunteer , Padakshep
www.padakshep.org
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