I was wondering if is possible just to change the width of the Square of the plot.

Using the BoxFrame i manage to change the width of the square and the grid, but I only want to change the Axes of X and Y bottom and top, left and right.

I found this online :

    hold on
    xl = xlim;
    yl = ylim;
    plot(xl,ones(1,2)*yl(1), '-k', ones(1,2)*xl(1), yl, '-k', 'LineWidth',2); % Left  & Lower Axes
    plot(xl,ones(1,2)*yl(2), '-k', ones(1,2)*xl(2), yl, '-k', 'LineWidth',2); % Right & Upper Axes    
    hold off

but since I have a plot(datatime,variableX) before, is send me an error message because I have datetime data, since datetime is 01/01/2016 00:00:00 etc

Best Regards,
Tiago

Looking at your site, I’ve found the following links.
http://undocumentedmatlab.com/blog/uiinspect
http://undocumentedmatlab.com/blog/getundoc-get-undocumented-object-properties

Thanks for your excellent site.

Please do reveal on how to unhide so that I can access it.

The BoxFrame property of an axes handle still exists as of R2017a. It’s hidden, but fully accessible.

Because of the EDT.
Also read this: http://undocumentedmatlab.com/blog/solving-a-matlab-hang-problem

Thanks! That works like a dream! (Why?)

I suggest that you add a call to drawnow; pause(0.1); after the grid creation and before requesting XGridHandle:

x=linspace(-1,1);
fx=x.^3;
pfx=plot(x,fx);
grid on;
ax=gca;
drawnow; pause(0.1);
xgh=ax.XGridHandle;
xgh.BackMajorEdge.ColorData=cast([0; 20; 20; 200],'uint8');

x=linspace(-1,1);
fx=x.^3;
pfx=plot(x,fx);
grid on;
ax=gca;
xgh=ax.XGridHandle;
xgh.BackMajorEdge.ColorData=cast([0; 20; 20; 200],'uint8');

Running this script (R2014b, 32 bit) I get:
“No appropriate method, property, or field BackMajorEdge for class matlab.graphics.GraphicsPlaceholder.”
If I put a breakpoint after the “grid on” command, and continue from the breakpoint, I get no error (and the grid change works).
This would be really useful if I could persuade it to work reliably. Any ideas?

Just wanted to add a comment to let you know that this post was extremely helpful; I was trying to figure out a way to help highlight some differences between surface plots and modifying the Z-axis gridlines worked perfectly. FWIW, I bought your “Undocumented Matlab” book a couple of years ago and it has proved useful time and again — thanks for both the book and the blog.

Regards,
WT