Re: [Tutor] TypeError: can't multiply sequence by non-int of type 'float'
Thanks all...I realized my mistake!!...:) On 4 April 2013 20:12, Andreas Perstinger andiper...@gmail.com wrote: Sayan Chatterjee sayanchatter...@gmail.com wrote: 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. The problem is not that the numpy array is a string but that you append the array to a python list: pv_za=[] pv_za.append(-K*np.sin(K*pv_za_temp)) pv_za_temp = [] pv_za_temp.append(np.array(pv_za)) Both pv_za and pv_za_temp are python lists to which you append a numpy array. But since you delete both lists in each iteration I assume you want to just assign a new numpy array to both names: pv_za = -K * np.sin(K * pv_za_temp) pv_za_temp = pv_za # pv_za is already a numpy array Bye, Andreas ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor -- -- *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 ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] TypeError: can't multiply sequence by non-int of type 'float'
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.e+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.e+00, -3.14159265e+00, 6.49753967e-13, 3.14159265e+00, -1.29950793e-12]])] - t*K*np.sin(K*p_initial) = [ -0.e+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 ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] TypeError: can't multiply sequence by non-int of type 'float'
I attach the script herewith. On 4 April 2013 19:10, Sayan Chatterjee sayanchatter...@gmail.com wrote: 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.e+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.e+00, -3.14159265e+00, 6.49753967e-13, 3.14159265e+00, -1.29950793e-12]])] - t*K*np.sin(K*p_initial) = [ -0.e+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 -- -- *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 ZA.py Description: Binary data ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] TypeError: can't multiply sequence by non-int of type 'float'
On 4 April 2013 14:40, Sayan Chatterjee sayanchatter...@gmail.com wrote: 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 K is somewhere above set to a float with the value 3.14... print 'pv_za_temp =',pv_za_temp pv_za_temp is somewhere above set to a list containing an array as it's only element. 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) Here you try to multiply the two. The error can be achieved like so: import numpy a = numpy.array([[1, 2], [3, 4]]) a array([[1, 2], [3, 4]]) 3.14 * a array([[ 3.14, 6.28], [ 9.42, 12.56]]) 3.14 * [a] Perhaps what you want is to multiply K with pv_za_temp[0]? [SNIP] K= 3.14159265359 pv_za_temp = [array([[ -0.e+00, -3.14159265e+00, 6.49753967e-13, 3.14159265e+00, -1.29950793e-12]])] Oscar ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] TypeError: can't multiply sequence by non-int of type 'float'
Sayan Chatterjee sayanchatter...@gmail.com wrote: 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. The problem is not that the numpy array is a string but that you append the array to a python list: pv_za=[] pv_za.append(-K*np.sin(K*pv_za_temp)) pv_za_temp = [] pv_za_temp.append(np.array(pv_za)) Both pv_za and pv_za_temp are python lists to which you append a numpy array. But since you delete both lists in each iteration I assume you want to just assign a new numpy array to both names: pv_za = -K * np.sin(K * pv_za_temp) pv_za_temp = pv_za # pv_za is already a numpy array Bye, Andreas ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
