numbytes 2009.12.06.py3k.cpp.static

bytearray numerical extension

REQUIRES PYTHON3.1
test usage: python3.1 setup.py build dev --quicktest
bytearray numerical extension

EXAMPLE USAGE:

$ python3.1
Python 3.1.1 (r311:74480, Sep 13 2009, 17:17:12)
[GCC 4.3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from numbytes import *

>>> ## create bytearray of 3x4 matrix of int64
>>> bytes_integer = numbytes("i", range(12), shape0=3, shape1=4)
>>> bytes_integer.debug()
<class 'numbytes.numbytes'> i refcnt=4 tsize=8 shape=<3 4> strides=<4 1> transposed=0

>>> ## underlying bytearray object
>>> print(bytes_integer.bytes)
bytearray(b'\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x03\x00\x00\x00\x00\x00\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00\x05\x00\x00\x00\x00\x00\x00\x00\x06\x00\x00\x00\x00\x00\x00\x00\x07\x00\x00\x00\x00\x00\x00\x00\x08\x00\x00\x00\x00\x00\x00\x00\t\x00\x00\x00\x00\x00\x00\x00\n\x00\x00\x00\x00\x00\x00\x00\x0b\x00\x00\x00\x00\x00\x00\x00')

>>> print(bytes_integer)
[[ 0 1 2 3]
[ 4 5 6 7]
[ 8 9 10 11]]

>>> ## slice
>>> print(bytes_integer[1:, 2:])
[[ 6 7]
[ 10 11]]

>>> ## transpose
>>> print(bytes_integer.T)
[[ 0 4 8]
[ 1 5 9]
[ 2 6 10]
[ 3 7 11]]

>>> print(bytes_integer.T[1:, 2:])
[[ 9]
[ 10]
[ 11]]

>>> ## recast into double type
>>> bytes___float = bytes_integer.recast("f") / 3
>>> print(bytes___float)
[[ 0 0.333333 0.666667 1]
[ 1.33333 1.66667 2 2.33333]
[ 2.66667 3 3.33333 3.66667]]

>>> ## most arithmetic operations are inplace
>>> ## use copy to avoid side-effects
>>> print(bytes_integer.copy[1:, 2:] + bytes___float.copy[1:, 2:])
[[ 8 9]
[ 13 14]]

>>> print(bytes___float.copy[1:, 2:] + bytes_integer.copy[1:, 2:])
[[ 8 9.33333]
[ 13.3333 14.6667]]

>>> print(bytes_integer.copy & bytes___float.copy)
[[ 0 0 0 1]
[ 0 1 2 2]
[ 0 1 2 3]]

>>> ## illegal bitwise operation on double
>>> print(bytes___float.copy & bytes_integer.copy)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ArithmeticError: cannot <double &= double>

RECENT CHANGE:
20091205 - moved source code to c++
20091116 - package integrated
20081219
- tobias rodaebel points out ".." is used in relative imports as well.
fixed pseudomethod 2 be compatible w/ this
- removed limitation where parser disallows use of keyword "__pseudomethod__"
in scripts