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numpy.matrix.nbytes

attribute

matrix.nbytes

Total bytes consumed by the elements of the array.

Notes

Does not include memory consumed by non-element attributes of the array object.

Examples

>>> x = np.zeros((3,5,2), dtype=np.complex128)
>>> x.nbytes
480
>>> np.prod(x.shape) * x.itemsize
480

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https://docs.scipy.org/doc/numpy-1.17.0/reference/generated/numpy.matrix.nbytes.html