转自：http://blog.sina.com.cn/s/blog_7db803c10102weyk.html

Matlab中legend默认的位置在NorthEast，如图所示：

%Matlab中legend的位置设置

clc
clear 
close all
Npoint = 100;
x = linspace(0,4*pi,Npoint);
y1 = sin(x);
y2 = cos(x);
H = plot(x,y1,x,y2);
legend(\'sin(x)\',\'cos(x)\');

然而，我们却可以通过Location对legend的位置进行改变，变为North，如图所示

%Matlab中legend的位置设置

clc
clear 
close all
Npoint = 100;
x = linspace(0,4*pi,Npoint);
y1 = sin(x);
y2 = cos(x);
H = plot(x,y1,x,y2);
legend(\'sin(x)\',\'cos(x)\',\'Location\',\'North\');

Matlab位置选择

Matlab中还可以选择某条曲线legend的指定显示

%Matlab中legend的选择

clc
clear 
close all
Npoint = 101;
x = linspace(0,10,Npoint);
y1 = besselj(1,x);
y2 = besselj(2,x);
y3 = besselj(3,x);
y4 = besselj(4,x);
y5 = besselj(5,x);
H = plot(x,y1,x,y2,x,y3,x,y4,x,y5);
legend(\'First\',\'Second\',\'Third\',\'Fourth\',\'Fifth\',\'Location\',\'NorthEastOutside\')

如果只想显示第1、3、5条，也很简单

%Matlab中legend的选择

clc
clear 
close all
Npoint = 101;
x = linspace(0,10,Npoint);
y1 = besselj(1,x);
y2 = besselj(2,x);
y3 = besselj(3,x);
y4 = besselj(4,x);
y5 = besselj(5,x);
H = plot(x,y1,x,y2,x,y3,x,y4,x,y5);
h1 = legend(H([1 3 5]),\'First\',\'Third\',\'Fifthth\',\'Location\',\'NorthEastOutside\')

还可以使用Orientation对legend进行横向排列

%Matlab中legend的横排，注意，Location位置改变为North

clc
clear 
close all
Npoint = 101;
x = linspace(0,10,Npoint);
y1 = besselj(1,x);
y2 = besselj(2,x);
y3 = besselj(3,x);
y4 = besselj(4,x);
y5 = besselj(5,x);
H = plot(x,y1,x,y2,x,y3,x,y4,x,y5);
h1 = legend(H([1 3 5]),\'First\',\'Third\',\'Fifthth\',\'Location\',\'North\');
set(h1,\'Orientation\',\'horizon\')

不显示方框：

clc
clear 
close all
Npoint = 101;
x = linspace(0,10,Npoint);
y1 = besselj(1,x);
y2 = besselj(2,x);
y3 = besselj(3,x);
y4 = besselj(4,x);
y5 = besselj(5,x);
H = plot(x,y1,x,y2,x,y3,x,y4,x,y5);
h1 = legend(H([1 3 5]),\'First\',\'Third\',\'Fifthth\',\'Location\',\'North\');
set(h1,\'Orientation\',\'horizon\',\'Box\',\'off\')