numpy « integer « Python Data Type Q&A

1. Convert little endian string to integer    stackoverflow.com

I have read samples out of a wave file using the wave module, but it gives the samples as a string, it's out of wave so it's little endian (for example, ...

2. Integer overflow in numpy arrays    stackoverflow.com

import numpy as np
a = np.arange(1000000).reshape(1000,1000)
print(a**2)

[[         0     ...

3. numpy convert categorical string arrays to an integer array    stackoverflow.com

I'm trying to convert a string array of categorical variables to an integer array of categorical variables. Ex.

import numpy as np
a = np.array( ['a', 'b', 'c', 'a', 'b', 'c'])
print a.dtype
>>> |S1

b = ...

4. boost.python argument type mismatch (numpy.int64 -> int)    stackoverflow.com

I'm running into this problem:

Boost.Python.ArgumentError: Python argument types in
    Dirichlet.Observe(int, numpy.int64, float)
did not match C++ signature:
    Observe(unsigned int, unsigned int, double)

5. What's the fastest way to filter a table of integers in Python?    stackoverflow.com

I have a dataset that consists of 7 columns and ~900k rows. All columns are non-unique, and all values are integers. Two important conditions for the filtering:

• I strictly want to see which ...

6. What's the fastest way to convert an interleaved NumPy integer array to complex64?    stackoverflow.com

I have a stream of incoming data that has interleaved real and imaginary integers. Converting these to complex64 values is the slowest operation in my program. This is my current approach:

import ...

7. Converting a hexadecimal character to an int in python    stackoverflow.com

I'm using the graphics library pyglet to do some drawing, and want to get the resulting image out as a python list (so I can convert it to a ...

8. NumPy types with underscore: int_, float_, etc    stackoverflow.com

What is the significance of the underscore suffixing, int_, float_, etc.?

9. How to access the specific locations of an integer list in Python?    stackoverflow.com

I have an integer list which should be used as indices of another list to retrieve a value. Lets say we have following array

    a = [1,2,3,4,5,6,7,8,9]

10. Convert array of string (category) to array of int from a pandas dataframe    stackoverflow.com

I am trying to do something very similar to that previous question but I meet error. I have a pandas dataframe containing features and label I need to do some convertion ...

11. In Python how will you multiply individual elements of an array with a floating point or integer number?    stackoverflow.com

S=[22 33 45.6 21.6 51.8]
P=2.45

SP=[53.9 80.85 111.72 52.92 126.91]

12. numpy integer overflowing.    python-forum.org

numpy integer overflowing. by MonsterAdurm Sat Feb 05, 2011 12:34 am im using an array of colour values to define circles on the screen. and an array of coordinates/pixels to plot them.using wxpython to convert the array to an image is working fine, however, i need the values of the arrays to be < 255. which i am having trouble ...