I'm not exactly sure what the question is.
If the question is: how to draw hundres of samples from the multi-variate normal distribution with a given mean and covariance, then an example is:
mu = [1 2];
Sigma = [1 2;3 4]*[1 2;3 4].';
x = mvnrnd(mu,Sigma,900); % 900 samples
% verify
mu
mean(x)
Sigma
cov(x)