Why are the random numbers obtained by different invocations to LOGRND() the same?

Question

Aditya Nanda 2016-12-25

1
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/318162-why-are-the-random-numbers-obtained-by-different-invocations-to-logrnd-the-same

回答： John Chilleri 2016-12-26

I used the LOGRND()[https://www.mathworks.com/help/stats/lognrnd.html] funtion to conduct a Monte Carlo Experiment. I used to two different functions(both are attached below) to call logrnd and stored the results in different mat files. The m-files are run remotely in a node using parallel computing.

However, the random parameters resulting from the two different invocations to logrnd are the same. How is this possible ?

Will using rng('shuffle') before calling logrnd() help ?

Appreciate the help.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

John Chilleri 2016-12-26

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/318162-why-are-the-random-numbers-obtained-by-different-invocations-to-logrnd-the-same#answer_248480

Hello,

This is possible because the two different invocations are running off the same initial seed, causing the same values to be generated.

Furthermore, using rng('shuffle') may not solve the problem, as it generates a random seed based on the current time; however, we might be able to get around this by placing a pause(some amount of time) in one of your functions before the use of rng('shuffle').

Hope this helps!