Python真火来学习一下，先来看一个库NumPy。NumPy是Python语言的一个扩充程序库。支持高级大量的维度数组与矩阵运算，此外也针对数组运算提供大量的数学函数库。numpy.genfromtxt()用于读取txt文件，其中传入的参数依次为：需要读取的txt文件位置，此处文件与程序位于同一目录下分割的标记转换类...

>>>>mya=np.zeros(shape=(2,2))>>>>myaarray([[0., 0.],      [0., 0.]])>>>>mya=np.empty...

1、转置对于二维数组有用，对一位数组无效2、理解特征值和特征向量的对应关系a=np.array([[1,2,3],[4,5,6],[7,8,9]])aOut[27]:array([[1,2,3],[4,5,6],[7,8,9]])w,v=LA.eig(a)wOut[29]:array([1.61168440e+01,-...

importnumpyasnpa=np.array([[1,2],[3,4]])a.shapeOut[3]:(2,2)b=np.array([[5,6]])b.shapeOut[5]:(1,2)np.concatenate((a,b))Out[6]:array([[1,2],[3,4],[5,6]])c=np.conc...

http://docs.scipy.org/doc/numpy/reference/generated/numpy.percentile.htmlnumpy.percentile(a,q,axis=None,out=None,overwrite_input=False,interpolation='linear',ke...

#网址http://docs.scipy.org/doc/numpy/reference/generated/numpy.matlib.randn.html#numpy.matlib.randnnumpy.matlib.randn(*args)[source]Returnarandommatrixwithdatafro...

Returnanarrayofoneswiththesameshapeandtypeasagivenarray.Parameters:a :array_likeTheshapeanddata-typeof a definethesesameattributesofthereturnedar...

Returnanewarrayofgivenshapeandtype,filledwithzeros.Parameters:shape :intorsequenceofintsShapeofthenewarray,e.g., (2, 3) or 2.dtype ...

 Returnanewarrayofgivenshapeandtype,filledwithones.Parameters:shape :intorsequenceofintsShapeofthenewarray,e.g., (2, 3) or 2.dtype...

>>importnumpyasnp>>>A1_mean=[1,1]>>>A1_cov=[[2,.99],[1,1]]>>>A1=np.random.multivariate_normal(A1_mean,A1_cov,10)#依据指定的均值和协方差生成数...

matlab是标准的，numpy相当于转置后计算>>x=[2,0,-1.4;2.2,0.2,-1.5;2.4,0.1,-1;1.9,0,-1.2]x=2.0000  0      -1.40002.2000  ...

将变量存储到txt，以便观察。...

numpy.hstack(tup)Stackarraysinsequencehorizontally(columnwise).Takeasequenceofarraysandstackthemhorizontallytomakeasinglearray.Rebuildarraysdividedby hspli...

http://docs.scipy.org/doc/numpy/reference/generated/numpy.random.uniform.html#numpy.random.uniform   http://docs.scipy.org/doc/ http://docs....

 matrix()和array()的区别，主要从以下方面说起： 1.矩阵生成方式不同importnumpyasnpa1=np.array([[1,2],[3,4]])b1=np.mat([[1,2],[3,4]])a2=np.array(([1,2],[3,4]))b2=np.mat(([1,2],...