Standard Deviation

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Firoz Alam
Firoz Alam 2011-9-28
Hi, I have S=[2 4 4 4 5 5 7 9]; can any one tell me how can I count and plot standard deviation in this values?
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Image Analyst
Image Analyst 2011-9-28
Sorry, no. Not until you supply more info on what you mean, like why you expect more than one standard deviation from that set of observations.
Firoz Alam
Firoz Alam 2011-9-29
or if the data set is s = [1:5; 6:10; 11:15], what will b the Std and std plot plz ? each row represent freq and column measurement valus... hope u undstd now

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Walter Roberson
Walter Roberson 2011-9-29
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));
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Firoz Alam
Firoz Alam 2011-9-30
thnx :)
Shivakumar
Shivakumar 2013-9-25
Thank you. I was helped by the answer.

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更多回答（1 个）

the cyclist
the cyclist 2011-9-29
The standard deviation of the values in S can be calculated with the std() command:
>> std(S)
I'm not sure what you mean by plotting that standard deviation.
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the cyclist
the cyclist 2011-9-29
Sorry, but I am very confused. The standard deviation is one number. What exactly do you want to plot? What are you trying to do, see, or understand about that set of numbers by plotting? Type "help plot" for help on one simple plotting command.
Firoz Alam
Firoz Alam 2011-9-30
its done ! thnx :)

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