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Mean and Norm of a time series.

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Haya Ali
Haya Ali on 18 May 2021
Edited: Haya Ali on 26 May 2021
I have calculated the mean and norm of a time series. But i am confused because the code gives different values when run in editor and command windows. Please help to resolve the issue
clear all; close all; clc;
x1=[11500.2 11477.9 11417.3 11426.4 11413 11382.9 11375.1 11347.9 11351.1 11329.3]
mx_1 = mean(x1); % assign the computed mean to a variable named mx
for i=1:length(x1)
x1(i) = (x1(i)-mx_1) / norm(x1); % correct use of norm function and use of variable mx
end
nx_1 = norm(x1); % assign the computed norm to a variable named nx
for i=1:length(x1)
x1(i) = x1(i)/nx_1; % use of variable nx
end
In editor it gives values as
mx_1 =
1.1390e+04
nx_1 =
0.0128
but when i write norm (x1) and mean (x1) in command windows it gives this
norm(x1)
ans =
1.0000
mean (x1)
ans =
-0.0041

Accepted Answer

Steven Lord
Steven Lord on 18 May 2021
The x1 variable you use to calculate mx_1 and nx_1 is not the same x1 that you use in the Command Window.
x1 = 1:10
x1 = 1×10
1 2 3 4 5 6 7 8 9 10
m1 = mean(x1)
m1 = 5.5000
x1 = normalize(x1, 'zscore') % This changes x1 so
x1 = 1×10
-1.4863 -1.1560 -0.8257 -0.4954 -0.1651 0.1651 0.4954 0.8257 1.1560 1.4863
m2 = mean(x1) % this variable is not equal to m1
m2 = 0

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