Binary random array with a specific proportion of ones?

Question

What is the efficient(probably vectorized with Matlab terminology) way to generate random number of zeros and ones with a specific proportion? Specially with Numpy?

Answer 1

You can use numpy.random.binomial. E.g. suppose frac is the proportion of ones:

In [50]: frac = 0.15

In [51]: sample = np.random.binomial(1, frac, size=10000)

In [52]: sample.sum()
Out[52]: 1567