matlab 的 legend 用法

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matlab绘图中legend的终极用法

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%持续更新。当前： 20100108 %

%仅作笔记。作者： keyflying %

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legend有时候挺烦人的，尽管大多时候挺好用。

基本数据：

data = rand(25)+repmat(1:25,25,1);
H = plot(data);

基本用法：

legend({'str1','str2','strn'});

高级用法1：指定legend显示的位置：

legend({'str1','str2','strn'},1);

legend({'str1','str2','strn'},2);

legend({'str1','str2','strn'},'Location','SouthEast');

可选的位置很多：

North：Inside plot box near top
South：Inside bottom
EastI：nside right
West：Inside left
NorthEast：Inside top right (default)
NorthWest：Inside top left
SouthEast：Inside bottom right
SouthWest：Inside bottom left
NorthOutside：Outside plot box near top
SouthOutside：Outside bottom
EastOutside：Outsideright
WestOutside：Outside left
NorthEastOutside：Outside top right
NorthWestOutside：Outside top left
SouthEastOutside：Outside bottom right
SouthWestOutside：Outside bottom left
Best：Least conflict with data in plot
BestOutside：Least unused space outside plot

通常，用'Best‘比较不错

高级用法2：指定显示某几条曲线的legend：

方法1：复杂到吐血

例如你有25条曲线，想显示其中1，6，11，16，21的legend，则

for i = [2:5 7:10 12:15 17:20 22:25]
set(get(get(H(i),'Annotation'),'LegendInformation'),'IconDisplayStyle','off');
end
legend('1','6','11','16','21');

方法2：简单到郁闷

H = plot(data);
legend(H([1 6 11 16 21],'1,'6','11’,'16','21');

高级用法3：legend横排

hl = legend(H([1 6 11 16 21],'1,'6','11’,'16','21');
set(hl,'Orientation','horizon')

高级用法4：不显示方框：

hl = legend(H([1 6 11 16 21],'1,'6','11’,'16','21');
set(hl,'Box','off');

参考文献

http://www.mathworks.cn/access/helpdesk/help/techdoc/creating_plots/braliom.html

doc legend

Site：http://hi.baidu.com/keyflying/item/7b39e9bbdcaceba5ebba936f

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另外，去掉legend边框，可以参考：http://www.newsmth.net/nForum/#!article/Paper/62848

legend('x','y')
legend('boxoff')

写两次就好了。我最初尝试着写成legend('x','y','boxoff')是不行的。

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修改legend的字体：

legend1=legend('x','y');
set(legend1,'FontName','Times New Roman','FontSize',12,'FontWeight','normal');

修改legend位置：

i=0;%i=0，自动调整最佳位置；i=1，右上；i=2，左上；i=3，左下；i=4，右下；

legend1=legend('x','y'，i);

20160518

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最好的说明文档，当然是帮助文档：

matlab:

doc legend

legend('hide'), legend(axes_handle,'hide') makes the legend in the current axes or the axes specified by axes_handle invisible.

legend('show'), legend(axes_handle,'show') makes the legend in the current axes or the axes specified by axes_handle visible. A legend is created if one did not exist previously. Legends created automatically are limited to depict only the first 20 lines in the plot; if you need more legend entries, you can manually create a legend for them all with legend('string1','string2',...) syntax.

legend('boxoff'), legend(axes_handle,'boxoff') removes the box from the legend in the current axes or the axes specified by axes_handle, and makes its background transparent.

legend('boxon'), legend(axes_handle,'boxon') adds a box with an opaque background to the legend in the current axes or the axes specified by axes_handle.

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