• 机器学习实战-学习笔记-第一章


    Added C:Anaconda and C:AnacondaScripts to PATH.

    C:Anaconda>python
    Python 2.7.10 |Anaconda 2.3.0 (64-bit)| (default, May 28 2015, 16:44:52) [MSC v.1500 64 bit (AMD64)] on win32
    Type "help", "copyright", "credits" or "license" for more information.
    Anaconda is brought to you by Continuum Analytics.
    Please check out: http://continuum.io/thanks and https://binstar.org
    >>> from numpy import *
    >>> random.rand(4,4)
    array([[ 0.38283202, 0.24411293, 0.20685839, 0.86908758],
    [ 0.82204289, 0.79030666, 0.54425868, 0.62909817],
    [ 0.69141424, 0.05570164, 0.86871815, 0.40525779],
    [ 0.49300032, 0.86729076, 0.62739796, 0.39128204]])
    >>> randMat = mat(random.rand(4,4))
    >>> randMat.I
    matrix([[ -1.65887525, -0.54674459, 0.6650344 , 1.61916868],
    [ 0.82374289, 6.37248535, 0.51246066, -3.93287389],
    [ 3.12497009, 19.45526575, -2.25589289, -10.31209844],
    [ -1.37650261, -18.53685293, 1.42581031, 10.04733715]])
    >>> invRandMat = randMat.I
    >>> randMat*invRandMat
    matrix([[ 1.00000000e+00, -8.02451972e-18, 1.01938807e-16,
    -6.19233770e-16],
    [ 5.76917009e-17, 1.00000000e+00, -2.23558531e-17,
    -8.65993001e-17],
    [ -1.22922458e-17, 1.02609061e-16, 1.00000000e+00,
    -1.43146861e-16],
    [ -3.67067733e-17, 1.72130614e-16, 1.16959073e-16,
    1.00000000e+00]])
    >>> myEye = randMat*invRandMat
    >>> myEye-eye(4)
    matrix([[ 2.22044605e-16, -8.02451972e-18, 1.01938807e-16,
    -6.19233770e-16],
    [ 5.76917009e-17, -1.11022302e-16, -2.23558531e-17,
    -8.65993001e-17],
    [ -1.22922458e-17, 1.02609061e-16, 0.00000000e+00,
    -1.43146861e-16],
    [ -3.67067733e-17, 1.72130614e-16, 1.16959073e-16,
    -3.33066907e-16]])
    >>>

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  • 原文地址:https://www.cnblogs.com/littlesuccess/p/5020956.html
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