def transform(self, x):
        return np.dot(x, self._matrix)
Test the various different ways of specifying an extension header in
dataset/ETHPy150Open kwikteam/phy/phy/traces/filter.py/Whitening.transform--crossover with--dataset/ETHPy150Open spacetelescope/PyFITS/pyfits/tests/test_core.py/TestCore.test_getext