def clearVertex(self, index):
        Parameter.checkIndex(index, 0, self.V.shape[0])
        self.V[index, :] = numpy.zeros((1, self.V.shape[1]))
fill from two aligned sequences.
dataset/ETHPy150Open charanpald/APGL/apgl/graph/VertexList.py/VertexList.clearVertex--crossover with--dataset/ETHPy150Open CGATOxford/cgat/obsolete/BlatTest.py/Match.fromPair