Legend error. What did I do wrong here?

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Hai Nguyen
Hai Nguyen 2020-10-2
评论： Adam Danz 2020-11-2
I have 9 figures as per attached to make comparisons for the length, width and height using similar codes as below (this one was used for the width comparison).
I don't know why the legend for the plots of length and height comparions are correct but it is wrong for the width comparison. How to fix please?
if true
fig = figure(16);
ax = axes(fig);
xlabel('\xi');
ylabel(' \omega(\xi,\tau)');
title('Varying injection rates vs fracture width');
h1 = openfig('width0.fig','reuse');
h2 = openfig('width1.fig','reuse');
h3 = openfig('width2.fig','reuse');
copyobj(h1.Children.Children,ax);
copyobj(h2.Children.Children,ax);
copyobj(h3.Children.Children,ax);
close(h1);
close(h2);
close(h3);
end
hold on
legend('\alpha=0','\alpha=1/9','\alpha=1/10','location', 'northeast')
  1 个评论
VBBV
VBBV 2020-10-2
编辑：VBBV 2020-10-2
% if true
% code
%end
legend([h1(1),h2(2),h3(3)], '\alpha=0','\alpha=1/9','\alpha=1/10','location', 'northeast')

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采纳的回答

Adam Danz
Adam Danz 2020-10-2
编辑：Adam Danz 2020-10-2
The "width" figures contain multiple lines on top of each other just like in your last question.
To demonstrate, open the width0.fig and look at the number of objects on the axes.
h = openfig('width0.fig');
h.Children.Children
% 2×1 Line array:
%
% Line
% Line
You'll see two line objects. If you only want to copy one of them,
copyobj(h.Children.Children(1),ax);
% ^^^
  9 个评论
显示 7更早的评论
Hai Nguyen
Hai Nguyen 2020-11-2
Sorry I still can't do as you instructed. It seems that I copied all the lines of each object for the legend again and the explanations in it are still unchanged (data 1, data 2...).
Code is as below:
fig1 = figure();
ax1 = axes(fig1);
xlabel('\xi');
ylabel(' \omega(\xi,\tau)');
title(ax1,'Varying injection rates vs fracture width');
leg=legend(ax1,'\alpha=0','\alpha=1/9','\alpha=1/10','location', 'northeast');
h1 = openfig('width0.fig','reuse');
h2 = openfig('width1.fig','reuse');
h3 = openfig('width2.fig','reuse');
copyobj(h1.Children.Children,ax1);
copyobj(h2.Children.Children,ax1);
copyobj(h3.Children.Children,ax1);
close(h1);
close(h2);
close(h3);
fig2=figure();
h = copyobj([ax1, leg], fig2);
title(h(1),'Varying injection rates vs fracture width');
Result:
Adam Danz
Adam Danz 2020-11-2
"data 1, data2, data 3,..." appears in the legend when the graphics objects do not contain a value for DisplayName as my comment above indicates. If you didn't assign a DisplayName value when you created those lines, then you'll have to recreate the legend from scratch after copying the lines.
fig1 = figure();
ax1 = axes(fig1);
hold on
h1 = openfig('width0.fig','reuse');
h2 = openfig('width1.fig','reuse');
h3 = openfig('width2.fig','reuse');
copyobj(h1.Children.Children,ax1);
copyobj(h2.Children.Children,ax1);
copyobj(h3.Children.Children,ax1);
close(h1);
close(h2);
close(h3);
xlabel('\xi');
ylabel(' \omega(\xi,\tau)');
title(ax1,'Varying injection rates vs fracture width');
leg=legend(ax1,'\alpha=0','\alpha=1/9','\alpha=1/10','location', 'northeast');
This assumes there 3 objects that are copied, since there are 3 strings defined in legend().

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