从给定的数字列表中随机选择数字

问题描述：

我给出了数字列表，

x=[x1, x2, x3, x4, x5, x6];
non_zero=find(x);

我希望Matlab一次在'non_zero'元素中随机选择任何一个.我在网上搜索过，但是没有可用的功能来提供所需的结果.

I want Matlab to randomly select anyone among elements of 'non_zero' at a time. I searched online but there is no such function available to provide my required results.

答

您可以使用函数randi从有效索引集中随机选择一个整数.

You could use the function randi to randomly select an integer from the set of valid indices.

x=[x1, x2, x3, x4, x5, x6];
non_zero=find(x);

index = randi(numel(non_zero));
number = x(non_zero(index))

或者，也许更清楚一点，首先创建一个x的副本，从该副本中删除零个元素，然后从[1 numel(x_nz)]范围中选择一个随机整数.

Or, perhaps a bit more clear, first make a copy of x, remove the zero elements from this copy, and then select a random integer from the range [1 numel(x_nz)].

x=[x1, x2, x3, x4, x5, x6];
x_nz = x; 
x_nz(x == 0) = 0;

index = randi(numel(x_nz));
number = x_nz(index)

为确保每次都不会获得相同的序列，请首先调用rng('shuffle')设置用于随机数生成的种子.

To ensure that you do not get the same sequence each time, first call rng('shuffle') to set the seed for random number generation.

从给定的数字列表中随机选择数字

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