C:\Python34\lib\site-packages\cvxopt\printing.py in matrix_str_default(X)
71
72 if height < m:
---> 73 s += "[" + min(n,width)*(center(':',twidth)+' ')
74
75 if width < n: s += ' ]\n'
NameError: name 'center' is not defined
---> 73 s += "[" + min(n,width)*(':'.center(twidth)+' ')