math « integer « Python Data Type Q&A

1. How to compute the nth root of a very big integer in python    stackoverflow.com

I need a way to compute the nth root of a long integer in python. I tried pow(n, 1.0/3), but obviously it doesn't work any ideas ? UPDATE: By long integer i mean ...

2. Implementation limitations of float.as_integer_ratio()    stackoverflow.com

Recently, a correspondent mentioned float.as_integer_ratio(), new in Python 2.6, noting that typical floating point implementations are essentially rational approximations of real numbers. Intrigued, I had to try ?:

>>> float.as_integer_ratio(math.pi);
(884279719003555L, ...

3. Splitting a 16 bit int into two 8 bit ints in python    stackoverflow.com

I have to convert a given 16 bit integer into two 8 bit integers, which are then taken and used as output, where they are headed takes the two 8 bit ...

4. Safest way to convert float to integer in python?    stackoverflow.com

Python's math module contain handy functions like floor & ceil. These functions take a floating point number and return the nearest integer bellow or above it. However these functions return the ...

5. How do you "concatenate" two 32 bits int to get a 64 bits long in Python?    stackoverflow.com

I want to generate 64 bits long int to serve as unique ID's for documents. One idea is to combine the user's ID, which is a 32 bit int, with the Unix ...

6. Division by zero: int vs. float    stackoverflow.com

Deviding an int by zero, will throw an exception, but a float won't - at least in Java. Why a float have an additional NaN info, while int haven't?

7. How do you handle extremely large values in python?    stackoverflow.com

How would I get python to work with values of the order of magnitude of 1099511627776 bits large (yeah. 137 gb)? I some what need to implement this (or if you ...

8. Python 3 integer division. How to make math operators consistant with C    stackoverflow.com

I need to port quite a few formulas from C to Python and vice versa. What is the best way to make sure that nothing breaks in the process? I hope my ...

9. Generate random integer weighted toward median    stackoverflow.com

Where in the range 10-20 there would be twice the probability of 15 being returned than either extreme.

10. Easiest way to get a list of whole factor pairs of a given integer?    stackoverflow.com

For example: f(20) would return [(1,20), (2,10), (4,5)].

11. Conditional for negative integer    stackoverflow.com

I'm defining a function that calculates the standard deviation of a list. Sometimes the mean of this list is negative and so my function can't take the square root of a ...

12. Changing python math module behaviour for non-positive numbers division    stackoverflow.com

Non-positive number division is quite different in c++ and python programming langugages:

//c++:
11 / 3 = 3
11 % 3 = 2
(-11) / 3 = -3
(-11) % 3 = -2
11 / (-3) = ...

13. How do I pass a fraction to python as an exponent in order to calculate the nth root of an integer?    stackoverflow.com

I'm attempting to write a simple python script that will calculate the squareroot of a number. heres the code i've come up with and it works. but i would like to ...

14. Integer divsion in Python    stackoverflow.com

I'm confused about the following integer math in python: -7/3 = -3 since (-3)*3 = -9 < -7. I understand. 7/-3 = -3 I don't get how this is defined. (-3)*(-3) = 9 ...