def expand(self, axisNames):
        for k in axisNames:
            if not self.has_key(k):
                self[k] = 0
Backwards subtraction (other-self)
dataset/ETHPy150Open LettError/MutatorMath/Lib/mutatorMath/objects/location.py/Location.expand--crossover with--dataset/ETHPy150Open NeuralEnsemble/python-neo/neo/core/irregularlysampledsignal.py/IrregularlySampledSignal.__rsub__