Too many points on x-axis

19 次查看（过去 30 天）
Karl
Karl 2013-6-4
If you run the following script, Matlab uses 0.5 increments on the x-axis. This gives the wrong label, since it starts over again after 6 points on the x-axis. Does anybody know how to make sure that the increments are made so that the labels get correct?
test= rand(11,8,6);
test2=test
Alder = {'<20', '2029','3039','4049','5059','6069','>70', 'all'};
Aar = {'2011', '2012', '2013_1', '2014_1', '2014_s2', '2014_s5'};
nAlder = length(Alder);
nAar = length(Aar);
figure
hold on
for iAlder = 1:nAlder
plot(squeeze(test2(11,iAlder,:)));
set(gca, 'XTickLabel',Aar)
end
hold off

请先登录，再回答此问题。

回答（2 个）

Karl
Karl 2013-6-5
编辑：Karl 2013-6-5
Putting the following line between the plot-command line and the XTickLabel-command worked
set(gca, 'XTick',[1 2 3 4 5 6])
Does anybody know why Matlab uses 0.5 increments on the axis? Is this always a problem, so that one always has to use the extra command line listed above in cases like mine?
  2 个评论
Iain
Iain 2013-6-5
Matlab just runs through a set process for determining the tick values. If you have more than 6 x values, you'll see the tick locations change.
If you want specific tick locations, you need to specify them.
Karl
Karl 2013-6-5
The funny thing is that there are only 6 values originally...

请先登录，再进行评论。

Jan
Jan 2013-6-5
Perhaps this helps:
figure
data = squeeze(test2(11, :, :));
plot(1:length(Alder), data); % perhaps: data.'
set(gca, 'XTickLabel', Aar, 'XTick', 1:length(Alder))
  2 个评论
Karl
Karl 2013-6-5
The same problem appears when running your commands.
I think this illustrates the source of the problem:
test= rand(11,8,6);
figure
hold on
for i= 1:8
plot(squeeze(test(11,i,:)));
end
hold off
Try running the commands above. You will see that there are 11 x-axis "labels/points" with 0.5 increments, dispite that there are only y-vaules for 6 of these points. I think this is the source of the problem. When one uses XThickLabel and a 1x6 vector, it will be repeated after the 6th point/label in the original plot. The question is why Matlab does not make 6 points in the first place. Has it something to do with the test-matrix having 11 rows?
Iain
Iain 2013-6-5
No. It simply comes up with what matlab reckons the best scaling is for the plot. It seems to try to ensure that there are BETWEEN 7 and 11 ticks.
Try:
for i = 1:30
figure
plot(randn(i,1))
end
You'll see what I mean.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Axis Labels 的更多信息

标签

Community Treasure Hunt

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

Start Hunting!

Translated by