How to change the mean value in the box plot?

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Lilya
Lilya 2016-5-19
评论： dpb 2016-5-21
Hi all, I want to replace the mean value in the boxplot to the RMSE. as figure illustrates.
Thank you in advance
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Lilya
Lilya 2016-5-19
Sorry. the figure is uploaded. Yes, I want to marker the RMSE value in the boxplot instead of the mean(or median) value.
dpb
dpb 2016-5-19
A boxplot marker is the median, NOT the mean...
To change this, you'll have to edit the box plot properties; there's a discussion in the help of finding the proper object via findobj and Tag values for the various options...

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the cyclist
the cyclist 2016-5-19
编辑：the cyclist 2016-5-19

Here is an example of what dpb is proposing to do:

x = randn(1000,3);

figure
boxplot(x)
h = findobj(gca,'Tag','Median');
set(h,'Visible','off');

Notice that I have found the lines that are tagged as "Median", and turned off their visibility.

Now, you could add a marker or line (or whatever) to indicate the RMSE.

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Lilya
Lilya 2016-5-20
Actually, the reason is to make the compared RMSE of the data clear enough to understand with respect to the whole set. Mr. Cyclist, I did as you did but the calculated RMSE number is not illustrated in the plot. Could you please help me again? thank you
dpb
dpb 2016-5-20
编辑：dpb 2016-5-20
Don't just tell us what you did, show the code itself in question.
Actually, after Cyclist's fixup, perhaps scatter would be the trick--
hold on
hS=scatter(1:3,0.5*rand(1,3),'filled');
Ayup, that puts a marker in the near-middle of the three boxen; text could label it as well...
ADDENDUM
Actually, to do this, it would be better to delete the line mean objects and add the scatter points or replace the '[x|y]yData' properties of the mean line and set the marker style as wanted instead of just making them invisible. There's no sense in keeping unused objects hanging around.

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dpb
dpb 2016-5-20
Building off of Cyclist's demo and the comments I made earlier--
x = randn(1000,3);
boxplot(x)
h = findobj(gca,'Tag','Median');
set(h,{'xData'},{[1];[2];[3]}, ...
{'yData'},{[0.1];[0.2];[0.3]}, ...
'marker','*','color','k')
NB: the use of cell arrays to set multiple handles to disparate values in a single call to set. For demo I used hardcoded values but they can be variable, of course, and mat2cell can be helpful to build the proper shape.
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dpb
dpb 2016-5-21
No problem, glad to help... :)
BTW, you can eliminate the temporary handle variable array by folding findobj into set...
set(findobj(gca,'Tag','Median') ...
{'xData'},{[1];[2];[3]}, ...
{'yData'},{[0.1];[0.2];[0.3]}, ...
'marker','*','color','k')
Like the objects themselves if not being used, I dislike keeping unneeded temporaries...

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