MATLAB: How to compute the mean and the standard deviation of a specific row from a matrix

histogrammeanstandard deviation

Hello everyone, I've got a matrix "x" 52×1000 double and I need to compute the mean and the std deviation of the last row. Is it correct writing: M= mean (x,52); S= std (x,52); ? Furthermore, how can I compute the histogram of the whole of the whole matrix? Thanks.

Best Answer

M = mean(x(end,:))
S = std(x(end.:))
histogram(x(:))

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MATLAB: Standard Deviation

numdev = floor((mean(S)-min(S))./std(S));

Determining the position of each standard deviation and plotting is left as a homework exercise.

Though possibly you want

numdev = floor((mean(S,2)-min(S,[],2))./std(S,[],2));

MATLAB: Calculate 2 standard deviations

Hi Chris, for a matrix of data

x = randn(10,4);
mean(x)+2*std(x)
mean(x)-2*std(x)

gives the sample means of the columns plus/minus 2 times the standard deviation. The question is whether you really want the sample standard deviation here, or the standard error of the mean.

Wayne

Best Answer

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MATLAB: Standard Deviation

MATLAB: Calculate 2 standard deviations

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