MATLAB: Standard deviation along 2 axes

3dMATLABstandard deviation

I am trying to calculate the standard deviation for a 3D dataset of size(3 x 51 x8). I am interested in getting the std values as a function of the 2nd dimension (51 pts). I don't have access to the image processing toolbox to be able to use "std2".

Thanks in advance for your help.

Best Answer

D3 = rand(3, 51, 8)
std(reshape(permute(D3,[1 3 2]),[],size(D3,2)))

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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

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));

Best Answer

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MATLAB: Calculate 2 standard deviations

MATLAB: Standard Deviation

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