MATLAB: Standard deviation array double

standard deviation

How to make the standard deviation of a double array??

Use std():

sd = std(yourDoubleArray(:))

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));

The "var" function will accept weights, and you can take the square root of the result.