Mean and Norm of a time series.

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

Answer 1

[Steven Lord]

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

[Haya Ali]

Thanks a lot!