How can I move the Xlabel without moving the X-Axis?

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Victor Hugo Garcia
Victor Hugo Garcia 2019-3-17
回答： Peter Seibold 2023-3-15
I am having a hard time positioning the XLabel outside the plot and centered without moving the X-axis which is in the origin, here's my code:
x = [0:0.001:0.083];
y = (169.7056)*sin((376.991)*x);
plot(x,y,'r-*');
ax = gca;
ax.XAxis.Exponent = -3;
set(gca,'XTick',0:0.005:0.090);
set(gca,'YTick',-200:10:200);
xlabel('TIEMPO EN MILISEGUNDOS','Fontsize',20,'FontWeight','bold','Color','b')
ylabel('VOLTAJE','Fontsize',20,'FontWeight','bold','Color','b')
ax.YAxisLocation = 'origin';
ax.XAxisLocation = 'origin';
grid on;
grid minor;
Here's where I would like to position the Xlabel:
Anotación 2019-03-17 125041.jpg
I would really appreciate your help!

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回答（3 个）

dpb
dpb 2019-3-17
编辑：dpb 2019-3-18
You've got to override the default position data for the label when move the axis location to center--
Ylm=ylim; % get x, y axis limits
Xlm=xlim; % so can position relative instead of absolute
Xlb=mean(Xlim); % set horizontally at midpoint
Ylb=0.99*Ylim(1); % and just 1% below minimum y value
hXLbl=xlabel('XLabel','Position',[Xlb Ylb],'VerticalAlignment','top','HorizontalAlignment','center');
"Salt to suit" positioning...having such in a callback function for axis resize/limits change would be needed to make it dynamically update.
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Nadav Arbel
Nadav Arbel 2021-10-3
编辑：Nadav Arbel 2021-10-3
note that the line:
Ylb=0.99*Ylim(1); % and just 1% below minimum y value
will take the xlabel abouve the y minimum value if the axis has negative values.
It is best (IMHO) to calc 1% of the y axis min value:
OnePerc = 0.01*Ylim(1)
and subtract it from the min value:
Ylb=Ylim(1) - abs(OnePerc); % and just 1% below minimum y value
Erfan Basiri
Erfan Basiri 2022-10-20
I think in the third line, Xlim should be changed to Xlm, and Ylim to Ylm in the next line

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Przemyslaw Barnas
Przemyslaw Barnas 2020-4-26
Just add 'Position', [x y] in your xlabel
ex.
xlabel('TIEMPO EN MILISEGUNDOS','Position',[40 -205],'Fontsize',20,'FontWeight','bold','Color','b')
  1 个评论
dpb
dpb 2020-4-26
Yes, but the solution I gave is relative to the current y-axis lower ylim value and the middle of the xlim range so will be relative to the actual position. You've just hardcoded in a fixed number. That works for a specific case but only for the specific case/data values.

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Peter Seibold
Peter Seibold 2023-3-15
If you want a constant distance from the x axis, use this code:
% Move x label closer to x-axis, here 16 px
figure(1);
clf
plot(-5:10,-1:14)
ax=gca;
axOldUnits=ax.Units;% omit this line if ax units already in pixels
ax.Units='pixels'; % omit this line if ax units already in pixels
Ypx=ax.Position(4); % get axis height in px
Ylim=ylim; % get y axis limits in data units
Xm=mean(xlim); % horizontal midpoint x axis
Data_px=(Ylim(2)-Ylim(1))/Ypx; % Data units per pixel
DistXL = Ylim(1)-Data_px*16; % Distance X-Label 16 px below x axis
xlabel('My x-label','Position',[Xm DistXL],'VerticalAlignment','top','HorizontalAlignment','center');
ax.Units=axOldUnits; % omit this line if ax units already in pixels

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