How can I calculate the mean of a vector ?

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Mallouli Marwa
Mallouli Marwa 2018-7-12
评论： Guillaume 2018-7-12
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,

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KSSV
KSSV 2018-7-12
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) ;
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Steven Lord
Steven Lord 2018-7-12
The 'omitnan' option for mean was introduced in release R2015a.
Guillaume
Guillaume 2018-7-12
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 2018-7-12
编辑：Jan 2018-7-12
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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