Problem with XTick: location of XTick doesn't match data.

5 views (last 30 days)
Xiaohan Du
Xiaohan Du on 23 May 2018
Commented: Xiaohan Du on 25 May 2018
Hi all,
I have the following script to plot 2 curves with 2 x-axis on top and bottom:
clear; clc; clf;
errxOri = [4 6 8 10 13 14 18 20 24 34 39];
errOriMax = [0.5279 0.37978 0.30287 0.19383 0.13164 0.11567 0.093856 ...
0.080826 0.05997 0.046702 0.033662];
errxPro = [4 7 8 10 12 14 22 26 30 33 38];
errProMax = [0.5279 0.38693 0.21168 0.16633 0.1322 0.1168 0.10034...
0.068223 0.060327 0.047501 0.032004];
figure(1)
ha1 = semilogy(errxOri, errOriMax, 'b-o', 'MarkerSize', 10, 'lineWidth', 3);
hold on
ha2 = semilogy(errxPro, errProMax, 'r-+', 'MarkerSize', 10, 'lineWidth', 3);
ax1 = gca;
ax1.XColor = 'b';
ax1.XTick = errxOri;
set(gca,'fontsize',20)
ax2 = axes(...
'Position', ax1.Position,...
'XAxisLocation', 'top',...
'Color', 'none',...
'YTick', [],...
'XLim', [0 39],...
'XTick', errxPro);
ax2.XColor = 'r';
ax2.XTick = errxPro;
set(gca,'fontsize',20)
grid on
But running it gives the following plot:
As you can see it does most of the job, just the xticks on top doesn't match the data (red cross), you can see the red cross is slightly offset from the vertical grid line. Why does this happen? How to fix it?
Many thanks!

Accepted Answer

Walter Roberson
Walter Roberson on 23 May 2018
You do not specify the xlim for the first axes and the two axes are not linked.
  3 Comments
Xiaohan Du
Xiaohan Du on 25 May 2018
Thanks Walter, very clear explanation! Problem has been solved now.

Sign in to comment.

More Answers (0)

Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!