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Heatmap Axis Labels Printing Vertically?

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Camille Woicekowski
Camille Woicekowski on 25 Jun 2020
Commented: dpb on 29 Jun 2020
Quick question, the x-labels on my heatmap are showing up vertically. I can't find the reason for this. This is what I have to generate the figure
x1 = linspace(17,23.5,14)
x2 = linspace(0,16.5,34)
xx = [x1 x2]
subplot('Position',pos1);
heatmap(xx, snow_height,snow11, 'Colormap', gray)
ax = gca;
tmp = ax.XDisplayLabels;
tmp(setdiff(1:end,1:6:end)) = {''};
ax.XDisplayLabels = tmp;
and this is what is showing up. How can I get the numbers oriented properly (horizontally) on the x-axis?

  2 Comments

dpb
dpb on 27 Jun 2020
" the x-labels on my heatmap are showing up vertically. I can't find the reason for this..."
The reason is that there are so many initially before you thin them out it tries to make fit as best it can.
Try commenting out the lines after the call to heatmap to see what looks like before...
Camille Woicekowski
Camille Woicekowski on 28 Jun 2020
Right, that's why I added those additional lines because it was completelly illegible before since there were far too many values. So, once I have it displaying as is, is there a way to rotate the labels? I need all the columns of data displayed, and heat map requires the number of x labels (yes, labels, not just values) to be the same as the number of columns mapped, so I haven't been able to find another option for this.

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Answers (2)

Yair Altman
Yair Altman on 29 Jun 2020
The heatmap's X labels orientation is dynamically determined based on the number of labels and the axes width. In other words, if you make the axes wider [for example by enlarging the figure window], the X labels may change orientation from vertical to horizontal.
You can control the labes orientation programmatically as follows (undocumented):
h = heatmap(...);
s = struct(h);
s.XAxis.TickLabelRotation = 90; % vertical
s.XAxis.TickLabelRotation = 60; % angled
s.XAxis.TickLabelRotation = 0; % horizontal
Yair Altman

  1 Comment

dpb
dpb on 29 Jun 2020
That's the ticket with struct! I was unaware of being able to do that.
Same thing in the end a little more directly; problem now is OP says has no effect on her plot.
But so far she hasn't provided full working example that illustrates the problem on her system to verify here.

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dpb
dpb on 26 Jun 2020
Oh, TMW has done it again -- they've buried stuff inside opaque (to the user) objects that should be visible. I wish they would quit doing this... :(
If you don't have it, go to FEX and download Yair Altman's utility for finding hidden objects...it's the only tool readily available for such.
From it
>> hHM=heatmap(xx,hh,ss)
hHM =
HeatmapChart with properties:
XData: {48×1 cell}
YData: {100×1 cell}
ColorData: [100×48 double]
Show all properties
>> undocumented(hHM)
ans =
struct with fields:
ApplicationData: [1×1 struct]
Axes: '???'
...
DefaultPropMap_Internal: [0×0 struct]
Description: 'HeatmapChart'
DescriptionMode: 'manual'
Description_I: 'HeatmapChart'
...
MissingDataValue: '???'
NodeChildren: [3×1 Graphics]
NodeParent: [1×1 ScribeLayer]
NotUsingTableForData: '???'
...
>>
Ah!! That looks interesting--let's see what we can tell about it...
>> hHM.NodeChildren
ans =
3×1 graphics array:
ColorBar
ColorBar
Axes
>>
And we were able to find an axes object.
>> hAx=hHM.NodeChildren(3)
hAX =
Axes with properties:
XLim: [17 16.5]
YLim: [0 1]
XScale: 'linear'
YScale: 'linear'
GridLineStyle: '-'
Position: [0.1300 0.1100 0.7179 0.8150]
Units: 'normalized'
...
>>
Under it we can find and set the tick label properties including rotation...
hAx.XAxis.TickLabelRotation=0;
IMO, there's absolutely no excuse for TMW having done such stuff.

  12 Comments

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Camille Woicekowski
Camille Woicekowski on 29 Jun 2020
Well, this is for work and it's not a public dataset, so I'm not comfortable uploading it on a public platform. I do appreciate the help though.
I'm using version R2020a
dpb
dpb on 29 Jun 2020
Just make a sample test case, then.
It shouldn't matter what the data are -- if you can't reproduce the above figure, then it would begin to appear you have uncovered a bug or have a system-related issue regarding the renderer and/or video driver...altho that would seem highly unlikely the cause of this symptom.
Attach a working sample script that has a problem there and I'll see if it reproduces issue here...
dpb
dpb on 29 Jun 2020
Or, my address is at contact site to send privately...
But, also, you never responded to the other Q? of what various whos or other queries at command line show on your system...

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