index of box plot outliers

11 vues (au cours des 30 derniers jours)
ahmed shaaban
ahmed shaaban le 16 Sep 2014
Commenté : Robert White le 9 Sep 2021
I am trying to label the outliers of the box plot with year number. in the following code, pre_1 is years 1950-2010 for only january, pre_2 is the same but for Feb, and so on to Dec. I am wondering how can i get the index of each outliers, the ydata gives me the outliers value, but I still cannot find the index.
pre12345101112=[pre_1 pre_2 pre_3 pre_4 pre_5 pre_6 pre_7 pre_8 pre_9 pre_10 pre_11 pre_12];
figure;boxplot(pre12345101112)
h = findobj(gcf,'tag','Outliers');
xdata = get(h,'XData')
ydata = get(h,'YData')
thanks in advance

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per isakson
per isakson le 17 Sep 2014
Modifié(e) : per isakson le 17 Sep 2014
Try this
m = randn(48,12);
e = eps(max(m(:)));
boxplot( m )
h = flipud(findobj(gcf,'tag','Outliers')); % flip order of handles
for jj = 1 : length( h )
x = get( h(jj), 'XData' );
y = get( h(jj), 'YData' );
for ii = 1 : length( x )
if not( isnan( x(ii) ) )
ix = find( abs( m(:,jj)-y(ii) ) < e );
text( x(ii), y(ii), sprintf( '\\leftarrowY%02d', ix ) )
end
end
end
it labels the outliers
  3 commentaires
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allan
allan le 12 Août 2017
Modifié(e) : allan le 12 Août 2017
What are the use of these two lines? e = eps(max(m(:))); ix = find( abs( m(:,jj)-y(ii) ) < e );
Also, is there a way to index the "subject" of the outliers instead of the 'value'?
Many thanks.
Robert White
Robert White le 9 Sep 2021
This was very helpful, thank you! Worked great.

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