Effacer les filtres
Effacer les filtres

How can I calculate the mean of a vector ?

29 vues (au cours des 30 derniers jours)
Mallouli Marwa
Mallouli Marwa le 12 Juil 2018
Commenté : Guillaume le 12 Juil 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.
Please help me Best,
  3 commentaires
Mallouli Marwa
Mallouli Marwa le 12 Juil 2018
Mean (V_freq1)
An error is appeared
Torsten
Torsten le 12 Juil 2018
mean, not Mean

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KSSV
KSSV le 12 Juil 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) ;
  3 commentaires
Steven Lord
Steven Lord le 12 Juil 2018
The 'omitnan' option for mean was introduced in release R2015a.
Guillaume
Guillaume le 12 Juil 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.

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Jan
Jan le 12 Juil 2018
Modifié(e) : Jan le 12 Juil 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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