package owl-base

``check p e`` raises the exception ``e`` if the predicate ``p`` is ``false``, otherwise returns ``unit``.

Parameters: * ``p``: predicate to check. * ``e``: exception to raise.

Returns: * ``unit``

Exception of not implemented yet.

Exception of found an element.

Exception of not found an element.

Exception of an empty array

Unit Test fails.

Fails if a matrix is not square.

Fail if two ndarrays have different shape.

Fail if the shapes of multiple ndarrays are not broadcastable.

Fail to converge.

Number of iteration exceeds the threshold.

Exception of singular matrix.

Exception of index out of boundary.

Exception of illegal gist name.