In Python 2.7, Numpy arrays and CVXOPT matrices are compatible and exchange information using the Array Interface.
A Numpy array is created from a matrix using Numpy’s array() method.
>>> from cvxopt import matrix >>> from numpy import array >>> A = matrix([[1,2,3],[4,5,6]]) >>> print(A) [ 1 4] [ 2 5] [ 3 6] >>> B = array(A) >>> B array([[1, 4], [2, 5], [3, 6]]) >>> type(B) <type 'numpy.ndarray'>
A CVXOPT matrix can be created from a Numpy array as follows.
>>> C = matrix(B) >>> type(C) <type 'cvxopt.base.matrix'>