scglue.num.col_var

scglue.num.col_var(X, Y=None, bias=False)

Column-wise variance (sparse friendly)

Parameters

• X (typing.Union[numpy.ndarray, scipy.sparse._base.spmatrix]) – First design matrix

• Y (typing.Union[numpy.ndarray, scipy.sparse._base.spmatrix, None]) – Second design matrix (optional)

• bias (bool) – Whether to return unbiased or biased covariance estimation

Return type

numpy.ndarray

Returns

col_var – Column-wise variance, if only X is given. Column-wise covariance, if both X and Y are given.