How is "quartely" defined in the function retime?

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Fabrice Lambert
Fabrice Lambert el 29 de Mayo de 2020
Comentada: Fabrice Lambert el 30 de Mayo de 2020
Hi. I am using retime to get quarterly mean data from irregularly distributed measurements:
yTT = retime(xTT,'quarterly',@nanmean);
My first measurement is on the 1st of April. The new yTT timetable has now timesteps at April, July, September, and January. My question is now are these quarterly values means of the widely used Mar-Apr-May, Jun-Jul-Aug, Sep-Oct-Nov, and Dec-Jan-Feb? Or is the April quarterly value an average of Apr-May-Jun, and so on?

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Adam Danz
Adam Danz el 29 de Mayo de 2020
According to Wiki,
  • First quarter, Q1: 1 January – 31 March (90 days or 91 days in leap years)
  • Second quarter, Q2: 1 April – 30 June (91 days)
  • Third quarter, Q3: 1 July – 30 September (92 days)
  • Fourth quarter, Q4: 1 October – 31 December (92 days)
While in the Chinese calendar, the quarters are traditionally associated with the 4 seasons of the year:
The months you see are the first month within the quarter.
  5 comentarios
Adam Danz
Adam Danz el 30 de Mayo de 2020
Editada: Adam Danz el 30 de Mayo de 2020
You're exactly right. That section of the code shifts the starting time of the timetable to the nearest quarter and then increments by 3-months from there.
I also agree that the documentation could be clearer. If you go to the retime() and synchronize() documentation pages online and scroll to the bottom, you can give those pages a star rating and then a window will appear allowing you to give feedback. I'll make this suggestion on both pages (you could, too, if you'd like).
Fabrice Lambert
Fabrice Lambert el 30 de Mayo de 2020
will do

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