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segment exact time of signal

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Farhad Abedinzadeh
回答： Lei Hou 2022-2-15
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?

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采纳的回答

Lei Hou
Lei Hou 2022-2-15
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.

更多回答（1 个）

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)

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