How can I calculate the mean of a vector ?

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,

[Dennis]

help mean()

[Mallouli Marwa]

Mean (V_freq1)

An error is appeared

[Torsten]

mean, not Mean

Answer 1

[KSSV]

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]

I think it's since R2014b (many versions anyway) that mean has had the 'omitnan' option, making nanmean completely redundant.

mean(x, 'omitnan')
%works the same as
nanmean(x)

[Steven Lord]

The 'omitnan' option for mean was introduced in release R2015a.

[Guillaume]

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.

Answer 2

[Jan]

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)