# How can I calculate the mean of a vector ?

4 views (last 30 days)
Mallouli Marwa on 12 Jul 2018
Commented: Guillaume on 12 Jul 2018
Hi
How can I calculate the mean of a vector ?
V_freq1 = 2*abs(VOLT1(6:NFFT/64))./( 2*abs( DISP1 (6:NFFT/64) ).*(2*pi*10)^2);
VOLT1, disp1 are vectors.
Torsten on 12 Jul 2018
mean, not Mean

KSSV on 12 Jul 2018
mean(V_freq1)
If your data has NaN's..have a look on nanmean.
% mean with inbuilt command
a = rand(100,1) ;
themean = 0 ; % the mean
for i = 1:length(a)
themean = themean+a(i) ;
end
themean = themean/length(a) ;
Guillaume on 12 Jul 2018
Steven, it's a long standing request of mine that this be documented in the function doc (just under the Introduced in ...). It would greatly help in writing backward compatible code.

Jan on 12 Jul 2018
Edited: Jan on 12 Jul 2018
Or:
m = sum(V_freq1) / numel(V_freq1)
Good ideas to solve such problems:
docsearch mean
help mean
Internet search engine: "Matlab mean"
For old Matlab versions and ignoring NaNs:
index = ~isnan(v);
m = sum(v(index)) / sum(index)

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