#from: http://stackoverflow.com/questions/16541618/perform-a-reverse-cumulative-sum-on-a-numpy-array #pythran export reverse_cumsum(float[]) #setup: import numpy as np ; r = np.random.rand(1000000) #run: reverse_cumsum(r) import numpy as np def reverse_cumsum(x): return np.cumsum(x[::-1])[::-1]