how to randomly vary 2 numbers?

2012 7 5
3 个回答
回答已采纳
更新时间：2022 4 2
25 次查看（30 天）

0 个投票

Hi! I want to generate a column of 30 randomly varying -1s and 1s. How can I do that? I was trying randi([-1:2:1],30,1) but that gives me zeros too and I don't want zeros, only -1 and 1. Thanks

请先登录，再回答此问题。

 采纳的回答

John Petersen
John Petersen 2012-7-5

1 个投票

x = 2*round(rand(30,1)) - 1;

3 个评论
显示 1更早的评论 隐藏 1更早的评论

Isabel
Isabel 2012-7-5
This gives me a column of zeros only. Thanks anyways
John Petersen
John Petersen 2012-7-5
编辑：John Petersen 2012-7-5
No it doesn't. Maybe you didn't grab the whole line?
Isabel
Isabel 2012-7-5
Sorry, it does work, my bad. I think I din't copy the whole formula or something. Thank you very much for your answer!

请先登录，再进行评论。

更多回答（2 个）

Andrei Bobrov
Andrei Bobrov 2012-7-5
编辑：Andrei Bobrov 2012-7-5

1 个投票

eg
A = (rand(5) > .5) + 0;
A(~A) = -1;
or
A = 2*randi([0 1],30,1) - 1;

类别

在 帮助中心 和 File Exchange 中查找有关 Random Number Generation 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by