plot lines with different x axes on the same MATLAB plot

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Fan Yang
Fan Yang 2021-10-26
评论： Fan Yang 2021-10-27
Ran in:
I am trying to plot two lines with diffenent x axes on the same plot, but matlab kept "avoiding" the first plot and only plot the second one.
(P.S. I checked the y1 and y2, none of them are off the scale of y axis.)
t = tiledlayout(1,1);
ax1 = axes(t);
ax2 = axes(t);
ax2 =
Axes with properties: XLim: [0 1] YLim: [0 1] XScale: 'linear' YScale: 'linear' GridLineStyle: '-' Position: [0.1300 0.1100 0.7750 0.8150] Units: 'normalized' Show all properties
ax1.XAxisLocation = 'bottom';
ax2.XAxisLocation = 'top';
hold(ax1,'on');hold(ax2,'on')
x1 = (1:10);
y1 = sin(x1);
plot(ax1,x1,y1,'r')
hold on
x2 = [11:30];
y2 = cos(x2);
plot(ax2,x2,y2,'b')
Display Data with Multiple Scales and Axes Limits - MATLAB & Simulink (mathworks.com)
The link above are the reference I based on develping this code

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Chris
Chris 2021-10-26
编辑：Chris 2021-10-26
Ran in:
Set the axes color of the second plot to 'none' so the lower axis can show through.
t = tiledlayout(1,1);
ax1 = axes(t);
ax2 = axes(t);
ax1.XAxisLocation = 'bottom';
ax2.XAxisLocation = 'top';
x1 = (1:10);
y1 = sin(x1);
plot(ax1,x1,y1,'r')
hold on
x2 = [11:30];
y2 = cos(x2);
%% Important line here
ax2.Color = 'none';
plot(ax2,x2,y2,'b')
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Chris
Chris 2021-10-26
编辑：Chris 2021-10-26
Ran in:
@Fan Yang No problem. When an axis is generated, the background is white.
figure('Color',[.7 .7 .7])
plot(1:10,1:10)
When you set the color to 'none', the background becomes transparent.
figure('Color',[.7 .7 .7])
plot(1:10,1:10)
set(gca,'Color','none')
Your first plot was there the whole time, but the second axis was covering it up. If you execute only the steps up to the first plot, you'll see it never shows at all, until you make the other axis transparent.
Does my explanation make sense?

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