retime 'regular' is not a valid specification of target time vector for synchronization.

Question

Peter Mills 2018-6-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/406162-retime-regular-is-not-a-valid-specification-of-target-time-vector-for-synchronization

回答： Steven Lord 2018-6-18

I have tried to use the code from here: https://uk.mathworks.com/help/matlab/ref/retime.html#d119e1004914 under 'Specify Time Step of Your Own' and I get an error. Why do I get an error when this is suggested code?

Time = datetime({'2015-12-18 07:29:53';'2015-12-18 08:00:00';... 
'2015-12-18 08:31:02';'2015-12-18 09:30:00'}); 
Temp = [37.3;41.9;45.7;39.8]; 
Pressure = [30.1;29.9;30.03;29.8]; 
TT1 = timetable(Time,Temp,Pressure) 
TT1 = 
4×2 timetable 
Time Temp Pressure 
____________________ ____ ________ 
18-Dec-2015 07:29:53 37.3 30.1 
18-Dec-2015 08:00:00 41.9 29.9 
18-Dec-2015 08:31:02 45.7 30.03 
18-Dec-2015 09:30:00 39.8 29.8 
>> dt = minutes(30); 
TT2 = retime(TT1,'regular','linear','TimeStep',dt) 
Error using timetable/retime (line 121) 
'regular' is not a valid specification of target time vector for synchronization.

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Answer 1

Steven Lord 2018-6-18

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/406162-retime-regular-is-not-a-valid-specification-of-target-time-vector-for-synchronization#answer_325128

The online documentation is for the most recent release. As I type this the most recent release is release R2018a. You're using an older release than R2018a. The syntax where retime accepts the inputs 'regular' with a 'TimeStep' or 'SamplingRate' was introduced in release R2018a.

Open your installation's documentation for retime and you'll see that syntax is not listed. You should also see examples that will work in the release you're using.