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Difference between lhsnorm and normrnd

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Ankush Kumar Mishra
评论： Ankush Kumar Mishra 2022-4-20
I am trying to understand the differnce between lhsnorm and normrnd. I generate two samples using same mean and std butthese metods are giving very different sample? The code is below
n = 50; % number of observations
noise_std = .02; % standard deviation of noise
d = 30;
mu = 0*ones(d,1);
sd = 0.2*ones(d,1);
sigma = 0.2*eye(d);
xtrain = lhsnorm(mu,sigma,n);
xtrain1 = normrnd(0,0.2,n,d);
I expected xtrain and xtrain1 to me similar but it is not. 30 features all with 0 mean and 0.2 std. Plese let me know if i am making mistake with lhsnorm.

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Paul
Paul 2022-4-20
The doc page for lhsnorm is surprisingly sparse. But it does talk about the multi-variable normal distribution, in which case sigma is usally the covariance of the distribution. So for xtrain try
Sigma = 0.2^2 * eye(d)
xtrain = lhsnorm(mu,Sigma,n);
The sigma input to normrnd is the standard deviation, as you've done in the code.

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