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Generate a random data with fix mean

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Ahmed Hussein
Ahmed Hussein 2014-1-7
评论： Image Analyst 2014-1-7
I have a matrix with 360 elements and I need to expand it to 3600 elements with the same mean and standard deviation.

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采纳的回答

Wayne King
Wayne King 2014-1-7
编辑：Wayne King 2014-1-7
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];
  2 个评论
Image Analyst
Image Analyst 2014-1-7
Of course repmat() also meets the requirements (or lack thereof).
vector3600 = repmat(vector360, [1, 10]);

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更多回答（2 个）

Ahmed Hussein
Ahmed Hussein 2014-1-7
The matrix is [1,360] and the distribution is Gaussian
Thank you very much
Ahmed Hussein
Ahmed Hussein 2014-1-7
Thank you very much

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