Mohamed Gaafar's profile - activity

overview network karma followed questions activity

2022-07-22 13:55:54 +0200	received badge	● Notable Question (source)
2021-02-23 11:38:51 +0200	received badge	● Notable Question (source)
2021-02-23 11:38:51 +0200	received badge	● Popular Question (source)
2020-05-02 12:21:12 +0200	received badge	● Popular Question (source)
2013-11-16 09:45:10 +0200	asked a question	plot arbitrary 2 vectors I just tried to plot these 2 vectors a and b: `sage: a = [0, 0, 0, 0, 0, 2/25, 13/20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] sage: b = range(50,70) sage: plot(a,b)` but an error occurs: ValueError: too many values to unpack any help ???
2013-11-04 05:23:26 +0200	commented answer	why using numpy thank you so much for your reply. The problem is that i am dealing with very large numbers that exceed the ranges fro numpy integers and doubles, so i have to use sage.
2013-11-04 05:20:03 +0200	received badge	● Supporter (source)
2013-10-25 15:37:07 +0200	asked a question	precision when using numpy when using numpy, do i have to take care of the ranges for integers, floats, ..etc. and what if the number exceeds the limits for int64 or float64, what shall i do then ? and does this problem exist als for the normal integer data type in sage ('sage.rings.integer.Integer'> ) ???
2013-10-25 15:33:45 +0200	asked a question	why using numpy what is the advantage of using numpy arrays, matrices, integers, floats, ..etc. over the normal ones in sage ??
2013-10-25 15:27:44 +0200	received badge	● Editor (source)
2013-10-25 15:11:00 +0200	asked a question	Problem with numpy integers and floats 1) 1st problem `sage: import numpy as np sage: a = np.int64(4343678784233766587) sage: b = np.int64(149) sage: ab 1572096270996914903` the answer is wrong; it should be 647208138850831221463 1) 2nd problem `sage: a = np.int64(3344773437777732743) sage: b = np.int64(181) sage: ab -3338562194645576845` the answer is negative, How Come ??? 1) 3rd problem `sage: a = np.float64(3344773437777732743) sage: b = np.float64(181) sage: ab 6.0540399223776962e+20 #the exact answer is 605403992237769626483` Why doesn't it give me all the numbers instead of this e20 ??? Moreover, i just used normal int of sage (`<type 'sage.rings.integer.Integer'>` ) without using numpy and it works fine !!! Thank you in advance.