distribution function
    (default 1e-5)
releps : float, optional
    Relative error tolerance for the cumulative distribution function
    (default 1e-5)

Examples
--------
When called with the default parameters, this will create a 1D random
variable with mean 0 and covariance 1:

>>> from scipy.stats import multivariate_normal
>>> r = multivariate_normal()
>>> r.mean
array([ 0.])
>>> r.cov
array([[1.]])

r