Gif from subplot not moving

Hi everyone, I'm trying to create a gif of subplots that are changing in value constantly, here is my code

for wt = 0:pi/8:2*pi
    v=VO.*exp(-j.*beta.*z).*(1+refl.*exp(2.*j.*beta.*z)).*exp(j*wt);
    i=VO.*exp(-j.*beta.*z).*(1-refl.*exp(2.*j.*beta.*z)).*(1/50).*exp(j*wt);
    subplot(2,1,1);
    plot(z,abs(v))
    subplot(2,1,2);
    plot(z,abs(i));
    filename = 'saved_gif.gif';
    del = 0.1; % time between animation frames
    drawnow 
    frame = getframe(1);
    im = frame2im(frame);
    [imind,cm] = rgb2ind(im,256);
    if wt == 0;
      imwrite(imind,cm,filename,'gif','Loopcount',inf,'DelayTime',del);
    else
      imwrite(imind,cm,filename,'gif','WriteMode','append','DelayTime',del);
    end
    end

[Walter Roberson]

Unfortunately we need the values of a number of variables in order to test the code.

[Jianing Zhang]

VO=1;
angle = 2*pi*111/360;
refl = 1*exp(angle*1i);
lambda = 0.05;
beta = 2*pi/lambda;
z=-0.15:0.0001:0;

Answer 1

[Walter Roberson]

abs(exp(j*(0:pi/8:2*pi))) are all identical to 1

abs(exp(-j*x)) is exp(imag(x)) and imag() of (0:pi/8:2*pi) is all 0, so that is all exp(0) which is identical to 1.

Your v and i values are all identical except for the exp(j*wt) term that is multiplying them all, so when you take abs() of that and the abs(exp(j*wt)) is always 1, then the abs() is the same for all of your loops. Therefore there is no movement: all of your calculations come out exactly the same.