How to change the Xtick direction of ONLY one of the two (top or bottom) X-axis lines ?

Question

Sim ，2023-3-16

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编辑： Sim ，2023-3-18

The following example shows two thick X-axis lines, one at the bottom and one at the top.

I would like to set the "TickDirection" as "Out" for the bottom X-axis line, and still keep the "TickDirection" as "In" for the top X-axis line.

How to do it?

% my plot

figure

plot(1:9)

% properties

ax = gca;

xax = ax.XAxis;

set(xax,'TickDirection','out')

set(xax,'TickLength',[0.03, 0.01])

set(xax,'Fontsize',20,'FontWeight','Bold','LineWidth',2);

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Answer 1

dpb 2023-3-16

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1929800-how-to-change-the-xtick-direction-of-only-one-of-the-two-top-or-bottom-x-axis-lines#answer_1194350

% my plot

figure

plot(1:9)

% properties

hAx1 = gca;

hAx1.XAxis.TickDirection='out';

hold on

hAx2=axes('Position',hAx1.Position,'Color','none');

hAx2.XAxisLocation='top';

hAx2.YAxis.Visible='off';

hAx2.XAxis.TickDirection='in';

And you see you still have the ticks on the opposite side of each the X- and Y- axes. HG2 (Handle Graphics 2) doesn't have the granularity to control the tick marks individually; either they show if 'Box' is 'on' or they don't if 'off'.

You would have to draw either ticks or the outer box manually to create the effect you're after, unfortunately.

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dpb 2023-3-17

The bowels are deeply complicated, indeed...those articles are quite old by now, of course, and most of the glitches have been resolved and TMW has continued to improve performance since the initial release.

The more frustrating part (to me, at least) is the trend towards releasing special-purpose <"Standalone Visualizations"> and making more of the properties in other base function plots hidden so that it takes a lot of "handle-diving" to find the necessary pieces-parts to be able to make oftentimes quite normal customizations of the base figure appearance.

I see no justification for doing this; while it can be nice to have the easy-to-use version that makes all these assumptions about what the user wants, and those may be adequate for the majority of the need, as a general-purpose programming language and research tool, making it difficult to customize these for a particular purpose simply puts roadblocks in the way of the serious user and wastes their time doing trivial customizations instead of real research/productive work.

Sim 2023-3-18

编辑：Sim 2023-3-18

I agree 100% about everything you wrote!! And it is exactly what I think for years... often, to adjust the most trivial things in a plot - those things that one expects to be very easy to handle -, I spend a considerable time and they are not easily accessible. This means that we need to dig deep in obscure half-hidden and undocumented/uncommented properties... Sometimes I wonder if Matlab competitors, such as Python or R, have similar intricate properties and features related to graphical adjustments... :-)

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Answer 2

Sim 2023-3-18

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1929800-how-to-change-the-xtick-direction-of-only-one-of-the-two-top-or-bottom-x-axis-lines#answer_1195795

编辑：Sim 2023-3-18

This is just a variation of the @dpb solution, that I have used in one case.

Please note that I write it here - instead of adding it in a comment - as an alternative solution.

Obviously, I will not accept it since it is a rearrangement of the @dpb solution.

% my plot
figure
plot(1:9)
% define the first axes (from the current axes) and set some properties
ax(1) = gca;
set(ax(1),'Fontsize',15,'FontWeight','Bold','LineWidth',2, 'box','on');
% define the second axes  and set some properties
ax(2) = axes('Position',ax(1).Position,'Color','none');
ax(2).XAxisLocation = 'bottom';
ax(2).YAxis.Visible = 'off';
ax(2).XAxis.TickDirection = 'out';
ax(2).XTickLabels = [];
ax(2).XTick = [0 ax(1).XTick];        % <-- Xticks positions in the 2nd axes as in the 1st axes
% link the first axes with the second axes
linkaxes(ax)
% other properties
ax(1).XRuler.TickLabelGapOffset = 20; % <-- adjust ticklabels away from axes
ax(2).XAxis.TickLength=[0.05 0];      % <-- change the length of the tick marks
set(ax(2),'Fontsize',15,'FontWeight','Bold','LineWidth',2, 'box','off');