how to plot the imaginary part of an array numbers as a minus y-axis data

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zina shadidi 2021-10-5

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1466836-how-to-plot-the-imaginary-part-of-an-array-numbers-as-a-minus-y-axis-data

评论： Mathieu NOE 2021-10-7

in developing a matlab code I need to plot the imaginary part of the frequency range in the negative y-axis range . the real part ( in the positive y-axis) and the imaginary part ( in the negative y- axis range)

here is the function in which the real part is ploted successfully, but the imag part is stuck

function []=plot_dispersion(Nk,k_norm,name_special_k,f)
f=real(f);
f1=imag(f);
max_nu=max(max(f));
plot(ones(100,1)*k_norm(1),linspace(0,max_nu*1.1,100),'k-','linewidth',2);
hold on;
for n=1:size(name_special_k,2)-1
    plot(linspace(k_norm(n),k_norm(n+1),Nk),f(:,(n-1)*Nk+1:n*Nk),'b.');
    plot(ones(100,1)*k_norm(n+1),linspace(0,max_nu*1.1,100),'k-','linewidth',2);
end
set(gca,'xtick',[],'fontsize',12);
ylabel('\nu (THz)','fontsize',12);
 xlabel ( ' (wavevector) ' )
axis tight;
for n=1:size(name_special_k,2)
    text(k_norm(n),-max_nu*0.05,name_special_k(n),...
        'interpreter','latex','fontsize',12);
end