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Adding a standard deviation to the equation

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Precious Benmaurice
回答： NISARGA G K 2018-3-19
Hi,I'm trying to find the standard deviation from this function code that I've written for my mean, please how do I adjust it in order to find the standard deviation from the code I have written? I've tried a few codes but its not running.
function [ret] = mymean(a)
%UNTITLED Summary of this function goes here
% Detailed explanation goes here
len = length(a);
store=0;
for i=1:len
store=store+a(i);
end
ret = store / len;
end

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回答（1 个）

NISARGA G K
NISARGA G K 2018-3-19
I understand you want to find standard deviation of the vector. Add the following line to your code to obtain the same
standard_deviation = sqrt(sum((a - ret).^2)./(len-1))
Alternately, you can use mean and std functions in matlab

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