概述
import numpy
numpy.array()
numpy.zeros()
numpy.ones()
numpy.eye()
numpy.array()
numpy.row_stack()
numpy.column_stack()
numpy.reshape()
>>> import numpy >>> numpy.eye(3) array([[ 1.,0.,0.],[ 0.,1.,1.]]) >>> numpy.zeros(3) array([ 0.,0.]) >>> numpy.ones(3) array([ 1.,1.]) >>> x1 = numpy.array((1,2,3)) >>> x1 array([1,3]) >>> x2 = numpy.array([4,5,6]) >>> x2 array([4,6]) >>> x3 = numpy.array((x1,x2)) >>> x3 array([[1,3],[4,6]]) >>> x4 = x3.reshape(2,3) >>> x4 array([[1,6]]) >>> x4 = x3.reshape(3,2) >>> x4 array([[1,2],[3,4],[5,6]]) >>> x5 = numpy.row_stack(x1,x2) Traceback (most recent call last): File "<stdin>",line 1,in <module> TypeError: vstack() takes exactly 1 argument (2 given) >>> x5 = numpy.row_stack((x1,x2)) >>> x5 array([[1,6]]) >>> x6 = numpy.row_stack([x1,x2]) >>> x6 array([[1,6]]) >>> x7 = numpy.row_stack((x6,x2)) >>> x7 array([[1,6],6]]) >>> x7[0] array([1,3]) >>> x7[1] array([4,6]) >>> x7[2] array([4,6]) >>> x8 = numpy.column_stack([x1,x2,x1,x2]) >>> x8 array([[1,4,1,[2,5],6,3,6]]) >>> x8[0] array([1,4]) >>> x8[1] array([2,5]) >>> x8[2] array([3,6]) >>> x8[3] Traceback (most recent call last): File "<stdin>",in <module> IndexError: index 3 is out of bounds for axis 0 with size 3 >>> x8[0][3] 4 >>>
python生成1行四列全2矩阵
print np.ones((1,4))*2
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