Legends display incorrect markers

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Ryan
Ryan 2012-11-8
The Incorrect markers will appear next to the strings in the legend.
for k = 1:size(Scattering,1)
hold on
if grade(k) == 0
figure(1)
plot(XS(k,x),XS(k,y),'bo')
elseif grade(k) >= 1
figure(1)
plot(XS(k,x),XS(k,y),'ro')
end
if grade(k) == 13 || grade(k) == 14
figure(2)
plot(XS(k,x),XS(k,y),'rx')
elseif grade(k) >= 16
figure(2)
plot(XS(k,x),XS(k,y),'kx')
end
end
set(get(get(figure(1),'children'),'xLabel'),'string',sprintf('PC%d',x))
set(get(get(figure(2),'children'),'xLabel'),'string',sprintf('PC%d',x))
set(get(get(figure(1),'children'),'yLabel'),'string',sprintf('PC%d',y))
set(get(get(figure(2),'children'),'yLabel'),'string',sprintf('PC%d',y))
set(get(get(figure(1),'children'),'title'),'string','Benign vs. Malignant')
set(get(get(figure(2),'children'),'title'),'string','High grade vs. Low grade cancer')
%get(get(figure(2),'children'),'children')
%legends correspond to plot order and not to given plots
legend(get(get(figure(1),'children'),'children'),'Benign','Malignant','Location','NorthEastOutside')
legend(get(get(figure(2),'children'),'children'),'High Grade','Low Grade','Location','NorthEastOutside')
hold off
I attempted to create a legend with a blue circle next benign and a red circle next to malignant. Instead there are blue circles next to both, and not coincidentally the last two objects plotted on the axes were both blue circles.
  3 个评论
显示 1更早的评论
Ryan
Ryan 2012-11-8
In the most recent run, Scattering was a 150x41 matrix, grade was a 150x1 matrix, and XS was a 150x5 matrix. I forgot to mention this warning pops up.
Warning: Ignoring extra legend entries.
> In legend at 291
In PLSAnalysis_Scattering at 45
Warning: Ignoring extra legend entries.
> In legend at 291
In PLSAnalysis_Scattering at 46

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采纳的回答

Matt Fig
Matt Fig 2012-11-8
编辑：Matt Fig 2012-11-8
I would dispense with keeping track of all that stuff anyway. Switching current figures in a loop, keeping track of handles, calling great-grandparents and children, setting the string property of xlabel and title objects and all? Not here!
This is much more straightforward and easier to understand:
figure
idx = grade==0;
plot(XS(idx,1),XS(idx,2),'bo')
hold on
idx = grade>=1;
plot(XS(idx,1),XS(idx,2),'ro')
xlabel(sprintf('PC%d',x))
ylabel(sprintf('PC%d',y))
title('Benign vs. Malignant')
legend('Benign','Malignant','Location','NorthEastOutside')
figure
idx = grade==13 | grade==14;
plot(XS(idx,1),XS(idx,2),'rx')
hold on
idx = grade>=16;
plot(XS(idx,1),XS(idx,2),'kx')
xlabel(sprintf('PC%d',x))
ylabel(sprintf('PC%d',y))
title('High grade vs. Low grade cancer')
legend('High Grade','Low Grade','Location','NorthEastOutside')

更多回答（1 个）

Sean de Wolski
Sean de Wolski 2012-11-8
Apparently the children order being returned is not what you expect. I would recommend explicitly saving the handles rather than getting children's grandchildren's great grandparents!
  2 个评论
Ryan
Ryan 2012-11-8
Had a lot of trouble with this method. I still couldn't get the second legend to display correctly, and I have no idea why I needed two hold on's.
hold on
fig1hand = figure(1);
fig2hand = figure(2);
for k = 1:size(Scattering,1)
hold on
if grade(k) == 0
plotbenhand = plot(get(fig1hand,'children'),XS(k,x),XS(k,y),'bo');
elseif grade(k) >= 1
plotmalhand = plot(get(fig1hand,'children'),XS(k,x),XS(k,y),'ro');
end
if grade(k) == 13 || grade(k) == 14
plot(get(fig2hand,'children'),XS(k,x),XS(k,y),'rx')
elseif grade(k) >= 16
plot(get(fig2hand,'children'),XS(k,x),XS(k,y),'kx')
end
end
hold off
legend(get(fig1hand,'children'),['mal';'ben'])
legend(get(fig2hand,'children'),['hig';'low'])
Sean de Wolski
Sean de Wolski 2012-11-9
You need the second hold on because you create the figures after the call to the first one. Thus they don't see the first one.
However, I don't see why you need either, considering you're only plotting to each figure once...

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