Plot vertical lines with time in x-axis?

Hi all,

I have plotted a signal with time in x-axis as follows:

lengthinms = datalength/fs*1000;
dt = lengthinms/datalength;
t=(0:datalength-1)*dt;
plot(t,data)

Thereafter, I have calculated the maximum of the signal in the certain time interval:

[amp, lat] = max(data(w_min:w_max));

I have tried to plot two vertical lines around the maximum value as:

line([lat-24, lat-24], [0, amp]); 
line([lat+24, lat+24], [0, amp]);

If I put samples on x-axis, the lines are placed correctly in the figure. However, when I put time in x-axis, the lines are in incorrect places. Could someone please let me know how can I plot the lines in the correct places when time is put on x-axis.

Thanks, Maria

Answer 1

[dpb]

lat is the index into the data array of the maximum location. You're not converting it to the time

t_lat=lat*dt;
line([t_lat-24, t_lat-24], [0, amp]);

etc., ...

[Maria]

Many thanks!

-Maria