xorbits.numpy.random.geometric

xorbits.numpy.random.geometric(p, size=None)

Draw samples from the geometric distribution.

Bernoulli trials are experiments with one of two outcomes: success or failure (an example of such an experiment is flipping a coin). The geometric distribution models the number of trials that must be run in order to achieve success. It is therefore supported on the positive integers, k = 1, 2, ....

The probability mass function of the geometric distribution is

\[f(k) = (1 - p)^{k - 1} p\]

where p is the probability of success of an individual trial.

备注

New code should use the ~numpy.random.Generator.geometric method of a ~numpy.random.Generator instance instead; please see the random-quick-start.

参数

• p (float or array_like of floats) – The probability of success of an individual trial.

• size (int or tuple of ints, optional) – Output shape. If the given shape is, e.g., (m, n, k), then m * n * k samples are drawn. If size is None (default), a single value is returned if p is a scalar. Otherwise, np.array(p).size samples are drawn.

返回

out – Drawn samples from the parameterized geometric distribution.

返回类型

ndarray or scalar

参见

random.Generator.geometric

which should be used for new code.

实际案例

Draw ten thousand values from the geometric distribution, with the probability of an individual success equal to 0.35:

>>> z = np.random.geometric(p=0.35, size=10000)  

How many trials succeeded after a single run?

>>> (z == 1).sum() / 10000.  
0.34889999999999999 #random

This docstring was copied from numpy.random.