segment exact time of signal

Hi dear viewers.

I want to extract the exact time of the signal,for example I have a signal which is 1*1000000 in size.

and the sampling frequency is 200hz,I want to extract 00:14:36 to 00:16:12 from this signal.

would you please help me?

Answer 1

[Lei Hou]

Hi Farhad,

You can also use timetable + timerange indexing to complete your task.

>> tt = array2timetable(val','StartTime',duration(0,0,0),'SampleRate',200);
>> tt(timerange(duration(0,14,36),duration(0,16,12),'closed'),:)

ans =

  19201×1 timetable

      Time      Var1
    ________    ____

    00:14:36     25 
    00:14:36     25 
    00:14:36     24 
    00:14:36     25 
    00:14:36     25 
    00:14:36     25 
    00:14:36     25 

       :         :  

    00:16:11     34 
    00:16:11     37 
    00:16:11     35 
    00:16:11     35 
    00:16:11     37 
    00:16:11     37 
    00:16:12     34 

	Display all 19201 rows.

Answer 2

[Benjamin Thompson]

So this should be the calculation for the start and end sample numbers:

>> (14*60+36)*200

ans =

175200

>> (16*60+12)*200

ans =

194400

Then if you have a million-element vector D with your data, you can extract what you want as:

D(175200:194400)