x : array_like
A 1-D or 2-D array containing multiple variables and observations.
Each row of x represents a variable, and each column a single
observation of all those variables. Also see rowvar below.
y : array_like, optional
An additional set of variables and observations. y has the same
shape as x.
rowvar : bool, optional
If rowvar is True (default), then each row represents a
variable, with observations in the columns. Otherwise, the relationship
is transposed: each column represents a variable, while the rows
bias : bool, optional
Default normalization (False) is by (N-1), where N is the
number of observations given (unbiased estimate). If bias is 1,
then normalization is by N.
allow_masked : bool, optional
If True, masked values are propagated pair-wise: if a value is masked
in x, the corresponding value is masked in y.
If False, raises an exception.