matlab绘图中legend的终极用法

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

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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

#Matlab