MATLAB: Where is the xlabel in yyplot

bugplot

The help on http://de.mathworks.com/help/matlab/creating_plots/plotting-with-two-y-axes.html suggests:

Label the left y-axis by passing the first axes to the ylabel function. Then, label the right y-axis by passing the second axes to the ylabel function. Label the x-axis using either axes.

ylabel(ax(1),'Semilog Plot') % label left y-axis
ylabel(ax(2),'Linear Plot') % label right y-axis
xlabel(ax(2),'Time') % label x-axis

But the xlabel does not appear in my matlab 2015a plot nor does it on the help page.

Edit: As a workaround

xlabel(ax(1),'Time') % label x-axis

worked. What did I do wrong? Or do matlab plot commands just always need a "work around"?

Best Answer

Very funny! You've found a documented bug.

 What did I do wrong?

Nothing.

 Or do matlab plot commands just always need a "work around"?

No, only sometimes.

Related Solutions

MATLAB: How to add XTickLabels in a subplot (2014a)

I think that part of the problem is that when the code calls axes or xlabel it applies the ticks or labels to the current axis which may not be the one corresponding to your subplot. I took the middle chunk of code from above (starting at %% title and labels ok, no tick labels on subplot1) and put it in a test.m file and stepped through each line and observed the changes to the subplots as the line was executed. It may be interesting to do the same.

Now in order to apply the ticks and labels to your choice of subplot, you need the handle to the axis of that subplot. That is easy:

 h = subplot(3,3,1);

Then to set the title, labels and ticks, do something like

 title(h,'subplot (1,1)');
 xlabel(h,'x');
 ylabel(h,'y');
 set(h,'XTickLabel',{'a','b','c'});

And repeat for the other subplots. Try the above and see what happens!

MATLAB: Using Multiple X- and Y-Axes Command Axis Label

figure (9)
ax1 = gca;
hl1 = line(x1,y1,'Color','r');
set(ax1,'XColor','r','YColor','r')
ax2 = axes('Position',get(ax1,'Position'),'XAxisLocation','top',... 
  'YAxisLocation','right','Color','none','XColor','k','YColor','k'); 
hl2 = line(x2,y2,'Color','k','Parent',ax2);
ylabel(ax1,'Drag Force (lbf.)')% do the same with ax2 
xlabel(ax1,'Time (s)')

Best Answer

Related Solutions

MATLAB: How to add XTickLabels in a subplot (2014a)

MATLAB: Using Multiple X- and Y-Axes Command Axis Label

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