如何防止图例在R2017a及更高版本中更新? [英] How to prevent the legend from updating in R2017a and newer?
问题描述
自MATLAB R2017a起,将图添加到轴时,图例会自动更新.以前,可以执行以下操作:
Since MATLAB R2017a, figure legends update automatically when adding a plot to axes. Previously, one could do this:
data = randn(100,4);
plot(data)
legend('line1','line2','line3','line4')
hold on
plot([1,100],[0,0],'k-')
绘制带有图例的四条数据线,然后为y = 0添加一条黑线.但是,从R2017a开始,这导致将黑色线条添加到图例中,名称为"data1".
to plot four data lines with a legend, and then add a black line for y=0. However, since R2017a, this leads to the black line being added to the legend, with the name "data1".
如何防止将此行添加到图例中,以使代码的行为像在旧版本的MATLAB中一样?
How do I prevent this line from being added to the legend, so that the code behaves like it did in older versions of MATLAB?
到目前为止,我在Stack Overflow上找到的唯一解决方案是在添加图例后将其删除.语法不太漂亮:
The only solution I have found so far on Stack Overflow is to remove the legend item after it has been added. The syntax is not pretty:
h = plot([1,100],[0,0],'k-'); % keep a handle to the added line
set(get(get(h,'Annotation'),'LegendInformation'),'IconDisplayStyle','off');
推荐答案
The release notes for MATLAB R2017a mention this change, and provide 4 different ways of handling the situation. These two methods are easiest to put into existing code:
1 :在添加黑线之前,请关闭图例的自动更新.这可以在创建时完成:
1: Turn off auto updating for the legend before adding the black line. This can be done at creation time:
legend({'line1','line2','line3','line4'}, 'AutoUpdate','off')
或之后:
h = findobj(gcf,'type','legend');
set(h, 'AutoUpdate','off')
您还可以更改所有将来图例的默认值:
You can also change the default for all future legends:
set(groot,'defaultLegendAutoUpdate','off')
2::关闭不需要添加到图例中的黑线的手柄可见性:
2: Turn off handle visibility for the black line that you don't want added to the legend:
plot([1,100],[0,0],'k-', 'HandleVisibility','off')
IconDisplayStyle
方法也在此处显示.但是,它们使用点表示法,这使语法有点漂亮:
The IconDisplayStyle
method is also shown here. However, they use the dot notation, which makes the syntax is a bit prettier:
h = plot([1,100],[0,0],'k-'); % keep a handle to the added line
h.Annotation.LegendInformation.IconDisplayStyle = 'off';
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