Plot figure with two x axes and resize without destroying bounding box

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Antonia Ciocoiu
Antonia Ciocoiu on 18 Aug 2021
Answered: Devyani Maladkar on 23 Aug 2021
I'm trying to plot a figure with two x axes (just one dataset is plotted, with different x axis values on the top AND bottom). I'm not able to 'link' the axes in a way that ensures the bounding lines don't get completely messed up when I resize the figure.
I've also tried using plotxx but the axis labels get cut off when resizing.
Here is the code I am using:
hAx(1)=gca;
plot(hAx(1),abs(E_avg_z)/1e6,g_f,'LineWidth',2)
set(hAx(1),'box','off')
hAx(1).XLim=[abs(E_avg_z(1))/1e6 abs(E_avg_z(end))/1e6];
hAx(2)=axes('XAxisLocation','top','YAxisLocation','right','color','none');
hAx(2).XLim=[0.01 0.4];
hAx(2).YTick=[];
set(hAx,'fontweight','bold'); % default fontsize is 10
set(hAx,'fontsize',16); % default fontsize is 10
set(gcf,'color','w');
Now if I try to resize the figure:
set(gcf, 'Units', 'centimeters', 'Position', [0, 0, 10, 50], 'PaperUnits', 'Inches', 'PaperSize', [20,20])
Then I get this:
I don't know how to fix this axis scaling error.

Answers (1)

Devyani Maladkar
Devyani Maladkar on 23 Aug 2021
Hello ,
It is my understanding that you want to plot a single dataset with two x axes (above and below) and one y-axis. It appears you are facing a difficulty in resizing of the plot using set which causes the x-axis to overlap.
To plot data with two x-axes and prevent the axis overlap issue one can use the tiled chart layout and create a 1x1 tiled layout object. The 2nd x-axis can be specified using the axes function called on the object . I have attached the code below, to plot the data using two x-axes and ensure no overlap or no labels are cut off. To replicate your issue, I have used sample data as below. More information in detail can be found here.
%Sample data to plot
x1 = 0:0.1:40; % x-axis coordinate for data
y1 = 4.*cos(x1)./(x1+2)+1200; % y-axis coordinate for data
% Setting up the first x axis and y-axis
t = tiledlayout(1,1);
ax1 = axes(t);
plot(ax1,x1,y1);
ax1.XLim=[x1(1) x1(end)];
xlabel(ax1,'Electric Field (Mv/m) ');
ylabel(ax1,'g-factor');
ax1.Box = 'off';
% Setting up the second x axis
ax2 = axes(t,'YTick',[],'XAxisLocation','top','YAxisLocation','right','color','none');
ax2.XLim=[1 20];
ax2.FontSize=16;
xlabel(ax2,'Plunger Voltage (V)');
ax2.Box = 'off';
set(gcf,'color','w');
set(gcf, 'Units', 'normalized', 'Position', [0, 0, 10, 50], 'PaperUnits', 'Inches', 'PaperSize', [20,20])
To prevent the label cutoff issue you can use normalized setting for units, this documentation has more details on Units and Position when using normalized.
Best Regards,
Devyani

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