Why the legend shows error ?

Question

Wiqas Ahmad 2023-1-19

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https://ww2.mathworks.cn/matlabcentral/answers/1897075-why-the-legend-shows-error

移动：Walter Roberson 2023-1-20

I'm getting the following error with the code:

figure;
hold on
[ax,h1,h2]=plotyy(distance,G.*(distance.^-2),distance,G);
set(ax,{'ycolor'},{'k';'k'},'Fontsize',16);
% set(ax(2),'ytick',[0:0.2:1.4],'fontsize',16);
plot(distance,(distance.^-2),'k--','LineWidth',2);
h1.Color = 'b';
h2.Color = 'r';
h1.LineWidth=2;
h2.LineWidth=2;
xlabel('\fontname{Arial}Range(m)');
set(gca,'xlim',[0 200],'xtick',[0:50:200]);
ylabel('\fontname{Arial}Backscattering signal intensity(unit)');
set(gca,'ylim',[0.*10.^-3 1.5.*10.^-3],'ytick',[0:.5:1.5].*10.^-3);
set(gca,'color','w','Fontsize',16,'LineWidth',1,'Fontweight','normal');
set(gca,'box','on','boxstyle','full','Fontname','Arial','Fontsmoothing','on');
set(gca,'xgrid','on','ygrid','on','gridcolor','k');
yyaxis right
ylabel('Overlap function value');
set(gca,'ylim',[0 1.4],'ytick',[0:0.2:1.4]);
set(gca,'Ycolor','k');
legend('Signal intensity (unit)','1/z^2','Overlap function','fontsize',12,'location','Northeast','orientation','vertical','numcolumns',1,...
    'box','on');
leg.ItemTokenSize = [15,18];
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0.3 0.3 .3 .45],'innerposition',[.11 .15 .15 .75]);

How can wee solve it?

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Dyuman Joshi 2023-1-19

I think you need to assign the legend to the variable 'leg'

Wiqas Ahmad 2023-1-20

I have tried it but of no use.

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Answer 1

dpb 2023-1-19

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https://ww2.mathworks.cn/matlabcentral/answers/1897075-why-the-legend-shows-error#answer_1152090

移动：dpb 2023-1-19

We don't have the data to try to reproduce, but I expect the problem is you're trying to mix the old plotyy and the new yyaxis syntax and they don't play well together.

Stick with one or the other and it'll probably work....if use all yyaxis calls, you'll get a legend object created by default; if you were then to assign the 'DisplayName' property to the line when plotted, they would show up automagically; then you could retrieve the legend handle (it's a child of the figure, not the axes) and make whatever global changes wanted there.

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Wiqas Ahmad 2023-1-20

在 MATLAB Online 中打开

I have removed the yyaxis syntax but still the problem persist. I also used handles to each line but none of them works. The code now is:

figure;
hold on
[ax,h1,h2]=plotyy(distance,G.*(distance.^-2),distance,G);
set(ax,{'ycolor'},{'k';'k'},'Fontsize',16);
plot(distance,(distance.^-2),'k--','LineWidth',2);
h1.Color = 'b';
h2.Color = 'r';
h1.LineWidth=2;
h2.LineWidth=2;
xlabel('\fontname{Arial}Range(m)');
set(gca,'xlim',[0 200],'xtick',[0:50:200]);
ylabel(ax(1),'\fontname{Arial}Backscattering signal intensity(unit)');
set(ax(1),'ylim',[0.*10.^-3 1.5.*10.^-3],'ytick',[0:.5:1.5].*10.^-3);
ylabel(ax(2),'\fontname{Arial}Overlap function value');
set(ax(2),'ylim',[0 1.4],'ytick',[0:0.2:1.4]);
set(ax(2),'Ycolor','k');
set(gca,'color','w','Fontsize',16,'LineWidth',1,'Fontweight','normal');
set(gca,'box','on','boxstyle','full','Fontname','Arial','Fontsmoothing','on');
set(gca,'xgrid','on','ygrid','on','gridcolor','k');
leg=legend('Signal intensity (unit)','1/z^2','Overlap function','fontsize',12);
leg.ItemTokenSize = [15,18];
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0.3 0.3 .3 .45],'innerposition',[.11 .15 .15 .75]);

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Answer 2

Walter Roberson 2023-1-20

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1897075-why-the-legend-shows-error#answer_1152535

移动：Walter Roberson 2023-1-20

在 MATLAB Online 中打开

legend({'Signal intensity (unit)','1/z^2','Overlap function'}, 'fontsize', 12, 'location', 'Northeast', 'orientation', 'vertical', 'numcolumns', 1,...
    'box', 'on');

but I wonde which MATLAB version you are using? You might possibly be using a version too early to support multiple columns.

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Wiqas Ahmad 2023-1-20

移动：Walter Roberson 2023-1-20

Thank you, Sir. You are right. I removed the "column" from the syntax and it works perfectly. By the way I'm using version R2017a and I think it doesn't support the multiple columns.

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