joining two different datetime arrays

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AA
AA 2016-11-4
回答： Walter Roberson 2016-11-4
Assume
datetime({'Mon, Apr-25-16';'Fri, Mar-25-1'},'InputFormat','eee, MMM-dd-yy')
datetime({'13:00; 14:23'},'InputFormat','eee, hh:MM')
how do I join both datetime arrays so that they become one?
  2 个评论
Jan
Jan 2016-11-4
What is a wanted output? Should the times be added to the dates, of do you expect a set of 4 date&time values?
AA
AA 2016-11-4
yes it should be added to the dates and the output should be a datetime array file because I want to later on use it in a candle stick chart. Thanks

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采纳的回答

Nick Counts
Nick Counts 2016-11-4
编辑：Walter Roberson 2016-11-4
You can use vertcat to combine your column arrays of datetime objects
vertcat( ...
datetime({'Mon, Apr-25-16';'Fri, Mar-25-1'}, 'InputFormat','eee, MMM-dd-yy'), ...
datetime({'Mon, Apr-25-16';'Fri, Mar-25-1'}, 'InputFormat','eee, MMM-dd-yy') )
might point you towards a solution?
Good luck!

更多回答（1 个）

Walter Roberson
Walter Roberson 2016-11-4
datetime() objects are not good for representing "naked" time-of-day, because the date chosen for them will not be relative to Jan 1, year 0, but instead will be taken relative to the date at the time the datetime() conversion is done. So parsing '14:23' would be taken to be '14:23 today". It would result in a full datetime object, and you cannot add datetime objects -- you cannot say datetime('31-03-2008') + datetime('14:23') to get '31-03-2008 14:23'.
On order to put together a datetime that represents a date and a datetime that represents a time of day, you need to convert the time of day to a duration from the beginning of the day, and then you can add the duration to the datetime that represents the date. You can do that with dateshift()
Date_and_time_together_datetime = Time_of_day_datetime - dateshift(Time_of_date_datetime, 'begin', 'day') + Date_datetime;

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