code: def getIndicesFromBigIndex(self, bigIndex):
          
          indices = numpy.array([0 for i in range(self.ndims)])
          for i in range(self.ndims):
              indices[i] = bigIndex // self.dimProd[i] % self.dims[i]
          return indices
docs: Get index set from given big index
          @param bigIndex
          @return index set
          @note no checks are performed to ensure that the returned
          big index is valid