def selectOut(self, outIds):
"""Choose a subset of SVD components (and remove all others)."""
# handle ElementSelector operating on SV (base class has no idea about)
# XXX think about more generic interface, where some 'measure' is assigned
# per each projection dimension, like in _sv in case of SVD.
# May be selector could be parametrized with an instance + attribute as literal
# so later on it could extract necessary values?
if isinstance(self._selector, ElementSelector):
ProjectionMapper.selectOut(self, self._selector(self._sv))
else:
ProjectionMapper.selectOut(self, outIds)
