Matlab绘图中legend的终极用法

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 top2 c/ ]9 I4 \, d) T9 L# _7 l- d
South：Inside bottom4 O* y# g& I0 O7 R
EastI：nside right8 w: C$ g- Q" E) G2 g4 {
West：Inside left& O! \2 t0 s6 a3 D; e9 N
NorthEast：Inside top right (default)
8 ?  U3 I9 a3 hNorthWest：Inside top left1 @( p& P: K; z! D4 x, \! B- C! A! C
SouthEast：Inside bottom right+ a5 n% t7 W: _  F( G; _
SouthWest：Inside bottom left% [4 L9 q9 e1 K
NorthOutside：Outside plot box near top
" D3 ^) n- ~- l+ ]; xSouthOutside：Outside bottom
4 c3 O6 Y. a$ ~% q8 s0 dEastOutside：Outsideright7 O, y- z" ]' o6 b! ]( q
WestOutside：Outside left/ P  J# ?' O4 y; v, z2 b( d- f
NorthEastOutside：Outside top right
8 u; p: n) u' ^3 v3 }NorthWestOutside：Outside top left
! c: [7 {+ \3 ~2 hSouthEastOutside：Outside bottom right
. C  J, K! I. Q" r9 [) s$ m" \SouthWestOutside：Outside bottom left3 k; ~+ |7 L$ {- F! ~
Best：Least conflict with data in plot
* t' ]( s1 F" K/ W0 JBestOutside：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]
3 F) c2 o% }9 w4 S$ Z: d0 sset(get(get(H(i),'Annotation'),'LegendInformation'),'IconDisplayStyle','off');
4 H% B; _) h1 ]- v2 X# ]end
. o- a2 @) @7 {. X. }legend('1','6','11','16','21');

方法2：简单到郁闷

H = plot(data);6 N2 X. C* g* G8 s  r% g! `8 [! p
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');
/ e7 {, s1 \9 {+ ~3 E) U4 e' ?  yset(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');) P& E. @# P+ c( H
set(hl,'Box','off');