How should I understand this code
显示 更早的评论
Hello,
I have a code segment of generating gaussian noise, but I don't understand why it does so.
p=1+rand(1)*99; Gaussian_noise=rand(n,m)*(p-50);
rand(1) generates a 1-by-1 matrix from uniform distribution [0 1], right? but why it multiply a 99? And then it generate a matrix as the same size of an image I(n,m) And then subtract 50 and multiply again
Thanks.
采纳的回答
Wayne King
2013-6-14
This does not look like it produces white Gaussian noise. For example:
n = 1000;
m = 1;
p=1+rand(1)*99; Gaussian_noise=rand(n,m)*(p-50);
hist(Gaussian_noise)
figure;
qqplot(Gaussian_noise)
Just use randn()
If you want a matrix of Gaussian white noise
X = randn(256,256);
That is zero mean, variance 1. Add a constant and scale to obtain a different mean and variance.
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Correlation and Convolution 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 
