import numpy as np

a = np.arange(9)

print "Reduce", np.add.reduce(a)
print "Accumulate", np.add.accumulate(a)
print "Reduceat", np.add.reduceat(a, [0, 5, 2, 7])
print "Reduceat step I", np.add.reduce(a[0:5])
print "Reduceat step II", a[5]
print "Reduceat step III", np.add.reduce(a[2:7])
print "Reduceat step IV", np.add.reduce(a[7:])
print "Outer", np.add.outer(np.arange(3), a)