Create a time vector

2022 6 30
1 个回答
更新时间：2022 7 2
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Hey guys, thanks in advance
I have a program that reads samples from hardware, and counts the time it takes to read that samples, so I have two variables of time in val2( the first time is the time it starts receiving, and the final time in val2 is the time it stops receiving).
I want to creat a time array in format :
Format = 'hh:mm:ss.SSS';
fs=10e6; % Frequency sampling of receiving the samples
And I want that this array is: first time: 1/fs : end time, basiccaly the values between the vector, should have the time dependent on the frequency sampling.
val2=['17-10-58_086'
'17-11-09_923'];

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回答（1 个）

Fangjun Jiang
Fangjun Jiang 2022-6-30

0 个投票

My answer to your previous question is the answer. Just change seconds(1) to seconds(1/fs)
https://www.mathworks.com/matlabcentral/answers/1751395-create-a-time-array

6 个评论
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Miguel Albuquerque
Miguel Albuquerque 2022-6-30
That code, gives me a vector in datetime, how Can I pass it to number?
Fangjun Jiang
Fangjun Jiang 2022-6-30
datenum(TimeVector)
Miguel Albuquerque
Miguel Albuquerque 2022-6-30
Im doing this
RS_time=datenum(RS_time,'HH:MM:SS');
But it gives this error:
RS_time is the time vector= 1 x 1367 datetime
Error using datetime/datenum
Too many input arguments.
Fangjun Jiang
Fangjun Jiang 2022-7-1
RS_time=datenum(RS_time)
Steven Lord
Steven Lord 2022-7-1
You don't need to use datenum here. Note that the last line of code in the answer I posted in the thread linked above returns the number of seconds between the two times as a double array. If you want the number of minutes, hours, or days just replace seconds in that code with the appropriate one of those functions.
I have this vector in appendix, that starts with the first time: 1/fs: last time. But htis vector is in datetime and I needed it in number, but with this format ('HH-mm-ss_SSS'),
Can I do this, thanks

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