how to find mean with nan
2 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Hi!
I want to find mean with nan values and with different step. My script is:
RowDivision=[1,46,172,305,472,618,714,784,920];
nElement=diff(RowDivision); % step
meanG=cellfun(@mean,(mat2cell(G,nElement,ones(size(G,2),1)))); %mean
but if i have one only nan value i.e. from 1 to 46 the mean is nan. How can I ignore the nan? Thank you!
0 commentaires
Réponse acceptée
Azzi Abdelmalek
le 10 Oct 2014
Modifié(e) : Azzi Abdelmalek
le 10 Oct 2014
a=[1 2 nan 3 nan 10]
nanmean(a)
%or
mean(a(~isnan(a)))
0 commentaires
Plus de réponses (2)
Andrew Reibold
le 10 Oct 2014
Modifié(e) : Andrew Reibold
le 10 Oct 2014
Use nanmean
If you dont have it, I wrote this
For an array, x
n_nans = 0;
temp = x;
for i = 1:length(x)
if isnan(x(i))
temp(i) = 0;
n_nans = n_nans+1;
end
end
mean = sum(temp)/(length(temp)-n_nans)
1 commentaire
Image Analyst
le 10 Oct 2014
If you have the Stats toolbox, use nanmeans. If you don't, you can do it in two lines of code, one to find the nans and one to get the mean:
% Create sample data
RowDivision=[1,46,172,305,472,618,714,784,920];
% Make some nans
RowDivision(2) = nan;
RowDivision(4) = nan
% Find the nans
nanElements = isnan(RowDivision)
% Compute the mean with no nans being considered.
meanNoNans = mean(RowDivision(~nanElements))
Actually you can do that in one line of code if you want.
1 commentaire
Image Analyst
le 10 Oct 2014
Oops - just like Azzi's edit which he posted while I was composing my response.
Voir également
Catégories
En savoir plus sur Logical dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!