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%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

doc legend

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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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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.