numpy.matlib.empty(shape, dtype=None, order='C')[source]

Return a new matrix of given shape and type, without initializing entries.

Parameters :

shape : int or tuple of int

Shape of the empty matrix.

dtype : data-type, optional

Desired output data-type.

order : {‘C’, ‘F’}, optional

Whether to store multi-dimensional data in C (row-major) or Fortran (column-major) order in memory.

See also

empty_like, zeros


empty, unlike zeros, does not set the matrix values to zero, and may therefore be marginally faster. On the other hand, it requires the user to manually set all the values in the array, and should be used with caution.


>>> import numpy.matlib
>>> np.matlib.empty((2, 2))    # filled with random data
matrix([[  6.76425276e-320,   9.79033856e-307],
        [  7.39337286e-309,   3.22135945e-309]])        #random
>>> np.matlib.empty((2, 2), dtype=int)
matrix([[ 6600475,        0],
        [ 6586976, 22740995]])                          #random

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