Adding outlier to a matrix

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Niki
Niki 2014-5-22
评论： Star Strider 2014-5-22
Hi , I have a matrix of intensities (n*p). I want to add an outlier to it. Do you have any idea about how to simulate an outlier? I was thinking to take the mean of matrix and then multiply it to some very high value?
Do you have any idea ?

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Star Strider
Star Strider 2014-5-22
I suggest:
M = rand(4,5); % Create data
Msts = [mean(M(:)) std(M(:))];
Outlier = Msts(1)+5*Msts(2);
Define the outlier by a multiple of the standard deviation from the mean. An value of 5*std is quite far out.
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Niki
Niki 2014-5-22
Not that one but this one helps
OutsXR = mean(X,1) + 5*std(X,[],1);
however, I accept your answer Thanks
Star Strider
Star Strider 2014-5-22
My pleasure, and thanks!

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Roger Wohlwend
Roger Wohlwend 2014-5-22
Actually you answered your question yourself. Instead of the mean I would use the maximum value of the matrix. Multiply that number by a certain value. That's all. It is quite easy.
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Niki
Niki 2014-5-22
In fact, I want to know whether it is scientifically correct or not? It is not a number. As I explained it is a matrix of n*p so I wont have a value as outlier but a row which corresponds as an outlier
On the other hand, do you know any way to show it as a outlier ?

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