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+//A function to compute standard deviation of a given data
+//Input: Data (a vector) and mean of the data as input
+//Output: standard deviation of the data
+
+function standard_dev = mystdev(data,mean_of_data)
+ temp = (data - mean_of_data*ones(length(data)))^2;
+ standard_dev = sqrt(sum(temp)/(length(data)-1));
+endfunction