3 examples of 'sum all elements in matrix python' in Python

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def sum(self, axis=None, dtype=None, out=None):
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    """
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    Returns the sum of the matrix elements, along the given axis.
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    Refer to `numpy.sum` for full documentation.
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    See Also
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    --------
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    numpy.sum
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    Notes
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    -----
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    This is the same as `ndarray.sum`, except that where an `ndarray` would
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    be returned, a `matrix` object is returned instead.
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    Examples
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    --------
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    >>> x = np.matrix([[1, 2], [4, 3]])
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    >>> x.sum()
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    10
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    >>> x.sum(axis=1)
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    matrix([[3],
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            [7]])
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    >>> x.sum(axis=1, dtype='float')
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    matrix([[ 3.],
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            [ 7.]])
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    >>> out = np.zeros((1, 2), dtype='float')
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    >>> x.sum(axis=1, dtype='float', out=out)
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    matrix([[ 3.],
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            [ 7.]])
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    """
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    return N.ndarray.sum(self, axis, dtype, out)._align(axis)

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@jit(native=True, xsimd=True)
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def row_sum(arr, columns):
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    return arr.T[columns].sum(0)

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def sum(l):
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    return reduce(operator.add, l)