How do I make two axes on the same plot using a single set of data?

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Nathaniel Werner 2017-4-7

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https://ww2.mathworks.cn/matlabcentral/answers/334272-how-do-i-make-two-axes-on-the-same-plot-using-a-single-set-of-data

Hello, I am trying to plot a curve with one shared y axis and two separate x axes. I am able to do this but I run into some problems.

First, after I run the code I wrote the data set seems to be smaller and doesn't line up correctly with either of the x axis grid points.
Second, the label of the top x axis is hidden and I don't know how to make the plot fit both nicely without stretching the plot window.

Here is my sample code.

figure
plot(x1,y1)
ax1 = gca;
ax1.XLabel.String = 'X-Label 1';
ax2 = axes('Position',get(ax1,'Position'),... 
'XAxisLocation','top');
plot(ax2,x2,y1)
ax2.XAxisLocation = 'top;
ax2.XLabel,String = 'X-Label 2';
ylabel('Y-Label 1')
title('TITLE')
grid on