How to generate Zero mean and unit variance

Question

Dick Rusell 2014-9-18

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/155333-how-to-generate-zero-mean-and-unit-variance

评论： the cyclist 2021-2-19

I'm not sure how to generate 1024 samples of pseudo random numbers with zero mean and unit variance using rand and to verify the results with mean, std, and hist.

2 个评论
显示无隐藏无

the cyclist 2014-9-18

What distribution do you want? Uniform? Normal? Something else?

Dick Rusell 2014-9-18

I think it is supposed to be uniform.

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Roger Stafford 2014-9-18

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/155333-how-to-generate-zero-mean-and-unit-variance#answer_152170

编辑：Roger Stafford 2014-9-18

在 MATLAB Online 中打开

If you want a uniform distribution do this:

   n = 1024;
   x = sqrt(3)*(2*rand(n,1)-1);

The random variable x will have a statistical mean of 0 and variance of 1. Of course any given n-element sample will deviate from these. These are only the statistically expected values.

2 个评论
显示无隐藏无

senthil vel 2019-1-8

why sqrt(3)*(2*rand(1024,1)-1)

Marius Hernes Brateng 2020-10-20

this comes from the definition of variance. Solve this equation for a, get a = sqrt(3).

请先登录，再进行评论。

Answer 2

the cyclist 2014-9-18

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/155333-how-to-generate-zero-mean-and-unit-variance#answer_152145

编辑：the cyclist 2014-9-18

在 MATLAB Online 中打开

randn(1024,1)

will generate 1,024 normally distributed values from a population with zero mean and unit variance.

3 个评论
显示 1更早的评论隐藏 1更早的评论

soumya dwibedy 2021-2-16

how to generate 1000 normally distributed values with (2 7 )mean and unit variance

the cyclist 2021-2-19

It's usually better to post a new question, than a comment on a 6-year-old one (even though this is related). People won't typically see a comment buried in an old post. It was just lucky that I did.

I don't understand what you mean by "(2 7)mean". Did you you mean just "27"?

请先登录，再进行评论。