Grouped error bars change position after saving figure
显示 更早的评论
I have a grouped bar graph with error bars (3 groups, 5 bars each, 15 bars and error bars total). When the figure is first created, the plot looks fine, but when I save (using file>saveas in the figure window) and repoen the figure, the error bars move from being centered on their respective bars (correct) to being centered on each group (incorrect). I've scowered the figure and errorbar property lists for a setting that might prevent this with no luck and there doesn't seem to be any other posts here that address this issue either.
Code
barHeights = [0.954, 0.666, 0.604, 0.842, 0.662;...
0.021, 0.280, 0.259, 0.145, 0.212;...
0.027, 0.075, 0.100, 0.022, 0.084];
barErrors = [0.023, 0.057, 0.091, 0.056, 0.081;...
0.007, 0.046, 0.080, 0.053, 0.091;...
0.018, 0.029, 0.029, 0.016, 0.034];
[nGroups,nBars] = size(barHeights);
groupNames = categorical("Group" + string(1:nGroups));
barNames = "Bar" + string(1:nBars);
figure;
hold on
b = bar(groupNames,barHeights,'FaceColor','flat');
title("Title");
xlabel("xlabel");
ylabel("ylabel");
grid on;
x = reshape([b.XEndPoints],[nGroups,nBars]);
errorbar(x,barHeights,barErrors,'k','linestyle','none');
legend(barNames);
hold off
Figure: Before Saving (CORRECT)
Figure: After Saving and Reopening (INCORRECT)
采纳的回答
The problem is caused by assigning numeric x-values to the errorbars on a categorical x-axis. The errorbar function works around the difference in axis ruler types but when the figure is generated again by opening the figure the x-values of the errorbars are assigned to the categorical x-values.
In fact, if you look at the XData values of the errorbars after they are generated, their values are actually the categorical x-values. It's surprising the errorbars are positioned in the right place to begin with.
ebh =errorbar(x,barHeights,barErrors,'k','linestyle','none');
ebh.XData
ans =
1×3 categorical array
Group1 Group2 Group3
ans =
1×3 categorical array
Group1 Group2 Group3
ans =
1×3 categorical array
Group1 Group2 Group3
ans =
1×3 categorical array
Group1 Group2 Group3
ans =
1×3 categorical array
Group1 Group2 Group3
Instead of using a categorical x-ruler, use a numeric x-ruler and set the tick labels,
barHeights = [0.954, 0.666, 0.604, 0.842, 0.662;...
0.021, 0.280, 0.259, 0.145, 0.212;...
0.027, 0.075, 0.100, 0.022, 0.084];
barErrors = [0.023, 0.057, 0.091, 0.056, 0.081;...
0.007, 0.046, 0.080, 0.053, 0.091;...
0.018, 0.029, 0.029, 0.016, 0.034];
[nGroups,nBars] = size(barHeights);
%groupNames = categorical("Group" + string(1:nGroups));
barNames = "Bar" + string(1:nBars);
figure;
hold on
b = bar(barHeights,'FaceColor','flat'); % REMOVE THE CATEGORICAL X-VALUES
title("Title");
xlabel("xlabel");
ylabel("ylabel");
grid on;
x = reshape([b.XEndPoints],[nGroups,nBars]);
errorbar(x,barHeights,barErrors,'k','linestyle','none');
% SET THE TICKS AND TICKLABELS
set(gca, 'XTick', b(1).XData, 'XTickLabel', "Group" + string(1:nGroups))
legend(barNames);
hold off
If you're using a MATLAB release prior to R2019b, compute x using x=b(1).XData'+[b.XOffset];
3 个评论
Andrew Soltisz
2021-5-18
Samy Alkhayat
2023-2-18
Hello Adam,
I have the same issue, I know your code works on MATLAB 2019 and later, but I have 2018 version.
It seems I need a replacement for
x = reshape([b.XEndPoints],[nGroups,nBars]);
in MATLAB 2018, any tips?
Thanks in advance!
This answer should point you in the right direction
Specifically,
x = b(1).XData'+[b.XOffset];
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Errorbars 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
