Running Cumulative sum of 1d NumPy Array

I have a numpy array like

x=np.array([1,2,3,4])

I want to create another numpy array y which is the cumulative sum 开发者_开发问答of x, so that

y=np.array([1,3,6,10])

What is a good num-Pythonic way to do this?

y = np.cumsum(x)

See http://docs.scipy.org/doc/numpy/reference/generated/numpy.cumsum.html

Another option is:

y = np.add.accumulate(x)

which is often times faster than np.cumsum even though the documentation says they are equivalent.