Set XTick of yyaxis to have integer ticks only

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hmhuang
hmhuang 2021-11-15
评论： dpb 2021-11-15
I have a plot with double y axes using yyaxis. I want to set XTick to have only integer values, e.g., 1, 2, 3, 4, 5, 6, instead of 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6.
With normal plot, I can just use:
ax = gca;
ax.XTick = unique(round(ax.XTick));
to achieve this goal.
But this seems not the case for yyaxis plot.
Please help!
---
Update: here is a MWE to illustrate my problem:
figure('Position', get(0, 'Screensize'));
max_iter = 100;
A_history = nan(1,max_iter); B_history = nan(1,max_iter);
for iter = 1 : max_iter
yyaxis left;
A_history(iter) = randn(1);
plot(A_history(1:iter), '-ob', 'LineWidth', 0.9, 'MarkerSize', 4.5, 'MarkerFaceColor', 'b');
ylabel('first yaxis');
yyaxis right;
B_history(iter) = randn(1);
plot(B_history(1:iter), '-or', 'LineWidth', 0.6, 'MarkerSize', 3, 'MarkerFaceColor', 'r');
ylabel('second yaxis');
% ax = gca;
% ax.XTick = unique(round(ax.XTick));
pause(1);
end
The above code will create xticks of 0, 0.1, 0.2, 0.3, 0.4, ..., 1 for the 1st iteration; xticks of 1, 1.1, 1.2, 1.3, 1.4, ..., 2 for the second iteration, for example.
What I want is to get rid of all the non-integer values (e.g., 0.1, ... ,0.9, 1.1, ... ,1.9) in the xticks, just leave integer values (e.g., 0,1 for the 1st iteration; 1,2 for the second iteration).
I have tried to add the commented 2 lines of code. But they don't give me the expected result, unfortunately. What's worse is that the xticks would become [0,1] all the time...
Hope this makes the problem description clearer.
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hmhuang
hmhuang 2021-11-15
编辑：hmhuang 2021-11-15
@Adam Danz My xticks are actually changing in each iteration, not fixed as your example shown. Can you please have a look at my updated post? Thanks!

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回答（1 个）

dpb
dpb 2021-11-15
编辑：dpb 2021-11-15
yyaxis right
plot(rand(1,20)*4, rand(1,20), '*')
yyaxis left
plot(rand(1,20)*6, rand(1,20), '*')
hAx=gca; % retrieve handle to current axes
hAx.YAxis(2).TickLabelFormat='%d'; % set RH y axis format string to integer
NB: the subscript on the YAxis handle array -- the specialized axes object created by yyaxis is a super axes container that has both LH and RH axes objects inside. The first array element is LH, the second the RH axis.
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Adam Danz
Adam Danz 2021-11-15
编辑：Adam Danz 2021-11-15
In the example from your question,
% To show the full plot from the start of the animation
ax = gca();
ax.XLim = [1,max_iter];
ax.XTick = unique(round(linspace(1,max_iter, 10))); % for up to 10 ticks
or
% To animate the x axis limits
ax = gca();
ax.XLim = [0,iter];
ax.XTick = unique(round(linspace(1,max_iter, 10))); % for up to 10 ticks

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