生成具有特定比例的0和1的随机数组 [英] Generate random array of 0 and 1 with specific ratio

问题描述

我想生成大小为N的随机数组，该数组仅包含0和1，但是我希望我的数组具有介于0和1之间的比率.例如，数组的90％为1，其余的10％为0(但是我想这90％在整个数组中都是随机的.

I want to generate random array of size N which only contains 0 and 1 but I want my array have some ratio between 0 and 1. For example 90% of array be 1 and the remaining 10% be 0(but I want this 90% be random along whole array).

现在我有:

randomLabel = np.random.randint(2, size=numbers)

但是我无法将比例控制在0和1之间.

But I can't control the ratio between 0 and 1.

推荐答案

如果您想要精确的1:9比例:

If you want an exact 1:9 ratio:

nums = numpy.ones(1000)
nums[:100] = 0
numpy.random.shuffle(nums)

如果您希望获得10％的独立概率:

If you want independent 10% probabilities:

nums = numpy.random.choice([0, 1], size=1000, p=[.1, .9])

或

nums = (numpy.random.rand(1000) > 0.1).astype(int)

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