Extracting from boxchart function the median, quartiles, and whisker data.

Hello dear community. I've got mutliple comparisons that I have plotted with boxchart. When I hover the cursor over any boxoplot, I can see the median, quartile, and whisker info. But I'm having difficulty extracting from the boxchart properities the numerical values. My goal is to the save directly these data value that boxchart clearly produce into an array.

Here's some mock code for three boxplots :

y1 = rand(10,1); 
y2 = rand(8,1);
y3 =rand(12,1);
X = [ones(length(y1),1); 2*ones(length(y2),1); 3*ones(length(y3),1)]; % boxchart positions for raw data
Y = [y1; y2; y3]; % raw data values
b = boxchart(X,Y);

If I where to type "b.DataTipTemplate.DataTipRows.Value" I can see the variables Whiskers and Medians and others but cannot access them with dot notation. How would I get the values for say the second box plot?

b.DataTipTemplate.DataTipRows.Value

ans = 'Position'

ans = 'Num Points'

ans = 'Num Outliers'

ans = 'Median'

ans = 'Quartiles'

ans = 'Whiskers'

ans = 'Outlier Value'

Thanks in advance.

Answer 1

[Matt J]

I don't believe those quantitites are directly available as permanent property data. When you position the cursor over one of the boxes, a GUI callback function is invoked to calculate them on the fly from the XData, YData property values. You can, of course, write your own function to do so as well.

[hxen]

Hi Matt. First thanks for writring. That's what I suspected but wasn't sure if I was missing something. That they list the Value names though makes me doubt this. Kinda silly they don't allow the dot-indexing to extract thost values directly from the boxchart run.

Thanks again. :)

[Matt J]

The real issue to me is that they call it a "Value" property when that's not what it is:

https://www.mathworks.com/help/matlab/ref/matlab.graphics.datatip.datatiptextrow.html#d124e337598

[hxen]

Agree. It was misleading in suggesting dot-indexed calling functionality. Thank you again for your time in writing.

Answer 2

[the cyclist]

As you may know, but just in case you do not, there is also the boxplot function, which has more flexibility than boxchart.

[hxen]

Thanks. I am reverting back to boxplot; initially had liked the features in boxchart.

Answer 3

[hxen]

Thank you all for the help. Much appreciated.