MATLAB: Generate a random data with fix mean

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I have a matrix with 360 elements and I need to expand it to 3600 elements with the same mean and standard deviation.

Best Answer

You don't say the size of your matrix, you just tell us the number of elements. You also do not give us any information about the distribution -- is it Gaussian?

 Xstart = randn(360,1);
 meanX = mean(Xstart);
 stdX = std(Xstart);
 Xend = [Xstart ; stdX*randn(3600-360,1)+meanX];

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MATLAB: Finding the standard deviation for every single value in a matrix

X=cat(3, X1,X2,X3,X4,X5,X6,X7,X8,X9,X10); %It was a mistake to create 10 separate matrices.
MeansX=mean(X,3),
StdX = std(X,[],3)

MATLAB: How to generate Zero mean and unit variance

If you want a uniform distribution do this:

   n = 1024;
   x = sqrt(3)*(2*rand(n,1)-1);

The random variable x will have a statistical mean of 0 and variance of 1. Of course any given n-element sample will deviate from these. These are only the statistically expected values.

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MATLAB: Finding the standard deviation for every single value in a matrix

MATLAB: How to generate Zero mean and unit variance

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