how to convert list to numpy array matrix code example

Example 1: convert list to numpy array

import numpy as np
npa = np.asarray(Lists, dtype=np.float32)

Example 2: convert list of lists to numpy array matrix python

x=[[1,2],[1,2,3],[1]]
y=numpy.array([numpy.array(xi) for xi in x])
type(y)
# <type 'numpy.ndarray'>
type(y[0])
# <type 'numpy.ndarray'>