problem with x-axis labels after overlapping 2 box plots
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Dawn
am 30 Mai 2014
Kommentiert: Kelly Kearney
am 2 Jun. 2014
I have the following code to compare two sets of box plots and there seems to be two misaligned x-axis labels after doing that! I have no idea what is causing this strange misalignment. Could the use of 'hold' be a problem in this case? Im using matlab 2014. Thanks.
x = rand(5,1);
y = rand(10,1);
z = rand(15,1);
Xpos = [2 5 12];
group = [repmat(Xpos(1), 5, 1); repmat(Xpos(2), 10, 1); repmat(Xpos(3), 15, 1)];
data=[x;y;z];
figure
boxplot(data, group,'positions', Xpos,'colors','k')
hold on
x =2+ rand(5,1);
y = 2+rand(10,1);
z = 2+rand(15,1);
group = [repmat(Xpos(1), 5, 1); repmat(Xpos(2), 10, 1); repmat(Xpos(3), 15, 1)];
data=[x;y;z];
boxplot(data, group,'positions', Xpos,'colors','r')
ylim([0 4])
4 Kommentare
Star Strider
am 30 Mai 2014
I can’t reproduce it in R2014a. Looks fine — no duplicated or repeated x values.
To wit:
Although it doesn’t match Dawn’s plot. There may be something strange in Dawn’s workspace (workspace variables?) or in her code that we are not privy to.
The real Question is what Dawn did to get MATLAB mad at her?
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Kelly Kearney
am 2 Jun. 2014
Bearbeitet: Kelly Kearney
am 2 Jun. 2014
The answer to the "why" is that boxplot, for reasons I've never been able to figure out, doesn't just change the tick positions and labels. Instead, it removes the xticks completely (or y-ticks, in the case of a horizontally-oriented boxplot) and replaces them with text annotation objects. And annotation objects are positioned relative to the figure, not the axis. Apparently slightly differently each time (possibly due to the fact that boxplot also, for reasons unknown, resizes axis, hence changing the figure-to-axis ratios between calls).
The easiest fix:
delete(findall(gcf, 'type', 'text'));
set(gca, 'xticklabelmode', 'auto', 'xtickmode', 'auto');
3 Kommentare
dpb
am 2 Jun. 2014
...boxplot, for reasons [unknown], doesn't just change the tick positions and labels. Instead, it removes the xticks ... and replaces them with text annotation objects
And how bizzaro!!! :( Seems worthy of bug report fer shure...at least an enhancement request to rid it of such foolishness. Who would ever think of doing such a thing????
Kelly Kearney
am 2 Jun. 2014
I think the original intent was to allow vertically-rotated tick labels (which is the default with the 'compact' option), but it's a pretty clunky implementation in my opinion.
I use boxplots quite a lot, and got really fed up with the heavy-handed axis changes, to the point that I wrote my own replacement:
Though my version handles multiple datasets a bit differently, and doesn't accept the Group input option.
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