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

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``402def sum(self, axis=None, dtype=None, out=None):403    """404    Returns the sum of the matrix elements, along the given axis.405406    Refer to `numpy.sum` for full documentation.407408    See Also409    --------410    numpy.sum411412    Notes413    -----414    This is the same as `ndarray.sum`, except that where an `ndarray` would415    be returned, a `matrix` object is returned instead.416417    Examples418    --------419    &gt;&gt;&gt; x = np.matrix([[1, 2], [4, 3]])420    &gt;&gt;&gt; x.sum()421    10422    &gt;&gt;&gt; x.sum(axis=1)423    matrix([[3],424            [7]])425    &gt;&gt;&gt; x.sum(axis=1, dtype='float')426    matrix([[ 3.],427            [ 7.]])428    &gt;&gt;&gt; out = np.zeros((1, 2), dtype='float')429    &gt;&gt;&gt; x.sum(axis=1, dtype='float', out=out)430    matrix([[ 3.],431            [ 7.]])432433    """434    return N.ndarray.sum(self, axis, dtype, out)._align(axis)``
``6@jit(native=True, xsimd=True)7def row_sum(arr, columns):8    return arr.T[columns].sum(0)``
``52def sum(l):53    return reduce(operator.add, l)``