legend多行标记-MALTAB

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legends={'V_G_S=-3','V_G_S=-2','V_G_S=-1','V_G_S=0','V_G_S=1','V_G_S=2','V_G_S=3'};
tx=[0.5  0.5  1.5 1.5  2.5  2.5  3.5];
ty=[0.5 0.2  0.5 0.2 0.5 0.2 0.5]*1e-27;
for i=1:7
    text(tx(i),ty(i),legends{i});
end
hold on
xlabel('V_D_S(Voltage)');
ylabel({'Induced gate Noise,id^2(1e^-^2^2) Amp^2/Hz)'})                             
x=[[0.5  0.5  1.5 1.5  2.5  2.5  3.5]-0.4;[0.5  0.5  1.5 1.5  2.5  2.5  3.5]-0.1];
y=[[0.5 0.2  0.5 0.2 0.5 0.2 0.5]*1e-27;[0.5 0.2  0.5 0.2 0.5 0.2 0.5]*1e-27];
hold on
h3=plot(x,y);
set(h3(1),'LineStyle','-','LineWidth',1,'Color','b')
set(h3(2),'LineStyle','-','LineWidth',1,'Color','m')
set(h3(3),'LineStyle','-','LineWidth',1,'Color','r')
set(h3(4),'LineStyle','-','LineWidth',1,'Color','c')
set(h3(5),'LineStyle','-','LineWidth',1,'Color','k')
set(h3(6),'LineStyle','-','LineWidth',1,'Color','g')
set(h3(7),'LineStyle','-','LineWidth',1,'Color','g')

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ljl86400

666666

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a=linspace(0,2*pi,100);
y1=100*sin(a);
y2=50*cos(a);
y3=tan(a);
y4=log(a);
y=[y1;y2;y3;y4];
figure
p=plot(a,y)

legend(p(1:2),'sin','cos');
ah=axes('position',get(gca,'position'),...
            'visible','off');
legend(ah,p(3:4),'tan','log','location','west');

zhuhuawe

a=linspace(0,2*pi,100);
y1=100*sin(a);
y2=50*cos(a);
y3=tan(a);
y4=log(a);
y=[y1;y2;y3;y4];
figure
p=plot(a,y)

legend(p(1:2),'sin','cos');
ah=axes('position',get(gca,'position'),...
            'visible','off');
legend(ah,p(3:4),'tan','log','location','west');