import numpy as np
x1 = np.array([10, 20, 30], float)
print "shape of x1 is ", x1.shape
print x1
x2 = x1[:, np.newaxis]
print "shape of x2 is ", x2.shape
print x2
x3 = x1[np.newaxis, :]
print "shape of x3 is ", x2.shape
print x2
---result---
shape of x1 is (3,)
[ 10. 20. 30.]
shape of x2 is (3, 1)
[[ 10.]
[ 20.]
[ 30.]]
shape of x3 is (1L, 3L)
[[ 10. 20. 30.]]
