import numpy
生成numpy矩阵的几个相关函数：
numpy.array()
numpy.zeros()
numpy.ones()
numpy.eye()
串联生成numpy矩阵的几个相关函数：
numpy.array()
numpy.row_stack()
numpy.column_stack()
numpy.reshape()
> import numpy
> numpy.eye(3)
array([[ 1., 0., 0.],
[ 0., 1., 0.],
[ 0., 0., 1.]])
> numpy.zeros(3)
array([ 0., 0., 0.])
> numpy.ones(3)
array([ 1., 1., 1.])
> x1 = numpy.array((1, 2, 3))
> x1
array([1, 2, 3])
> x2 = numpy.array([4, 5, 6])
> x2
array([4, 5, 6])
> x3 = numpy.array((x1, x2))
> x3
array([[1, 2, 3],
[4, 5, 6]])
> x4 = x3.reshape(2, 3)
> x4
array([[1, 2, 3],
[4, 5, 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, 2, 3],
[4, 5, 6]])
> x6 = numpy.row_stack([x1, x2])
> x6
array([[1, 2, 3],
[4, 5, 6]])
> x7 = numpy.row_stack((x6, x2))
> x7
array([[1, 2, 3],
[4, 5, 6],
[4, 5, 6]])
> x7[0]
array([1, 2, 3])
> x7[1]
array([4, 5, 6])
> x7[2]
array([4, 5, 6])
> x8 = numpy.column_stack([x1, x2, x1, x2])
> x8
array([[1, 4, 1, 4],
[2, 5, 2, 5],
[3, 6, 3, 6]])
> x8[0]
array([1, 4, 1, 4])
> x8[1]
array([2, 5, 2, 5])
> x8[2]
array([3, 6, 3, 6])
> x8[3]
Traceback (most recent call last):
File "<stdin>", line 1, 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
总结
以上就是本文关于Python numpy生成矩阵、串联矩阵代码分享的全部内容，希望对大家有所帮助。感兴趣的朋友可以继续参阅本站其他相关专题，如有不足之处，欢迎留言指出。感谢朋友们对本站的支持！