我该怎么办才能不显示所有情节的图例？

Question

这是我的代码:

N=100;
n=50;
tau=0.001;
h=0.01;
lambda=tau/h;
mu=lambda/2;
u=zeros(N,n);
u1=zeros(N,n);
u2=zeros(N,n);
phi=zeros(n,1);
for i=1:n
    for j=1:N
        u(j,i)=cos(2*pi*i*(j-1)*h);
        u1(j,i)=cos(2*pi*i*((j-1)*h-tau));
    end

    for j=2:N
        u2(j,i)=u(j,i)-lambda*(u(j,i)-u(j-1,i));
    end
u2(1)=0;
phi(i,1)=2*pi*i/N;    
end
uf=zeros(n,1);
uf1=zeros(n,1);
uf2=zeros(n,1);

for i=1:n
   for j=1:N
       uf(i,1)=uf(i,1)+(u(j,i)*exp(-1i*(j-1)*phi(i,1)))/100;
       uf1(i,1)=uf1(i,1)+u1(j,i)*exp(-1i*j*phi(i,1))/100;
       uf2(i,1)=uf2(i,1)+(u2(j,i)*exp(-1i*(j-1)*phi(i,1)))/100;
   end
end
final=zeros(n,1);
for i=1:n
    final(i,1)=-(h/(1i*tau))*(log(uf2(i)/uf(i)));
end


figure;
hold on 
z=1:1:n;
b = real(final(z,1));
%plot(phi(z,1),b,'o');
c = imag(final(z,1));
%plot(phi(z,1),c,'-');
%plot(phi(z,1),0,'-');
plot(phi(z,1),b,'ro',phi(z,1),c,'ko',phi(z,1),0,'k-');
legend('Real','Imaginary');
legend ('Location','NorthWest');
xlabel('Reduced Wavenumber')
ylabel('Modified Wavenumber')

我正在y = 0处绘制一条线作为参考.我不希望他们在传说中.但我得到这个数字: 我该如何解决这个问题？

Answer 1

而不是用一个plot命令绘制所有内容,而是这样做:

plot(phi(z,1),b,'ro'); hold on
plot(phi(z,1),c,'ro'); hold on
plot(phi(z,1),0,'k-'); hold off

legend('Real','Imaginary','Location','NorthWest');
xlabel('Reduced Wavenumber')
ylabel('Modified Wavenumber')

那你不应该有问题.

实际原因是,在这种情况下,图例的调用方式不同.更优雅的解决方案提供了Magla的答案.