writing normally distributed error code
显示 更早的评论
Hello all,
I have an equation
Y = aX + E.....
E is error term that is N ~ ( 0 , [ 25 0 ; 0 25] ) , how I can write a code for E in this case know that it will be 2 x1 matrix size. that is normally distibuted with 0 mean and 25 standard deviation
Thank you in advance.
5 个评论
Lina Alhelo
2019-6-2
Bjorn Gustavsson
2019-6-2
Yes, that is what N(m,C) means, that you have a random numbers with expected values m and covariance C. Your case is what one typically do to model normal-distributed "random noise in measurements".
Lina Alhelo
2019-6-2
编辑：Lina Alhelo
2019-6-3
Bjorn Gustavsson
2019-6-3
I typically use something like this for scalar white noise with standard deviation proportional to the sqrt(intensity):
I = I_ideal + I_ideal.^.5*randn(size(I_ideal));
Maybe the documentation to normrnd gives you more information?
HTH
Lina Alhelo
2019-6-3
编辑：Lina Alhelo
2019-6-3
采纳的回答
Bjorn Gustavsson
2019-6-2
1 个投票
Have a look at: randn, and normrnd.
HTH
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Lognormal Distribution 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
