numpy

2014-05-06

MacPorts + Python 2.7 で:

$ port select --list python
Available versions for python:
	none
	python25-apple
	python26-apple
	python27 (active)
	python27-apple

$ sudo port install python27 +universal +tkinter
$ sudo port install py27-numpy py27-scipy py27-matplotlib

$ python
Python 2.7.6 (default, Nov 19 2013, 19:15:05) 
[GCC 4.2.1 Compatible Apple LLVM 5.0 (clang-500.2.79)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy
>>> import scipy
>>> import matplotlib

import してエラーがでないことを確認。

matplotlib?

しかし import matplotlib.pyplot あたりをやるとフリーズしてしまう。

matplotlib を使うのに sudo port install gnuplot は必要ないらしい。

参考 http://coffee.guhaw.com/Entry/221/

http://d.hatena.ne.jp/wikuba/20110613/1307979627

mean/average

>>> import numpy as np
>>> a = np.array([(1,2,3),(2,3,4),(3,4,5),(4,5,6)])
>>> a
array([[1, 2, 3],
       [2, 3, 4],
       [3, 4, 5],
       [4, 5, 6]])
>>> np.average(a, axis=0)
[ 2.5  3.5  4.5]
>>> np.average(a, axis=1)
[ 2.  3.  4.  5.]
>>> a.mean(axis=0)
array([ 2.5,  3.5,  4.5])
>>> a.mean(axis=1)
array([ 2.,  3.,  4.,  5.])
>>> a.mean(axis=-1)
array([ 2.,  3.,  4.,  5.])

リストに戻すには:

>>> m = a.mean(axis=0)
>>> m
array([ 2.5,  3.5,  4.5])
>>> type(m)
<type 'numpy.ndarray'>
>>> lst = m.tolist()
>>> lst
[2.5, 3.5, 4.5]
>>> type(lst)
<type 'list'>

numpy.txt · 最終更新: 2014/05/06 10:23 by Takuya Nishimoto
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