how to plot vertical dotted line ??

i want plot vertical dotted line on the same figure(scale 25), at samples: 180 and 220 the length of my ecg is 2000??

    load ecg.m;
    subplot(221);
    plot(ecg); title ('ECG');
    xlabel('samples'); ylabel('magnitude');

 fs=360;
subplot(222)
CWTcoeffs = cwt(ecg,20:55,'sym4','plot');
colormap jet; colorbar;
subplot(223);
qrs_thr_end=220;
qrs_thr_on=180;
plot(CWTcoeffs(25,:)); title('Scale 25');

Answer 1

[Ahmed raafat]

x=your_value*ones(1,length_of_y);

plot(x,y)

[Good mind]

ahmed,thank you very much. so, how can i get it dotted??

[Ahmed raafat]

plot(x,y,'.')

[Good mind]

salam ahmed,thank you