closest day a year back

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joseph Frank
joseph Frank 2012-10-21
Hi,
I have a vector of dates and my alogorithm is picking one observation X in a loop. I want to go back an exactly year back from the date of X. but the date sometimes doesn't exist because it is not a working a day and I am interested only in working days. How can I choose from this vector the closest working day which is X-365 but if it doesn't exist then it should be X-364 or X-363 etc..

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回答（2 个）

Star Strider
Star Strider 2012-10-21
编辑：Star Strider 2012-10-21
Here's a simple routine that should work:
refdate = datenum([2012 10 16]); % Test Day1
refdate = datenum([2012 10 15]); % Test Day2
yearago = addtodate(refdate, -1, 'year');
[Nya, Sya] = weekday(yearago)
if Nya == 1
yearago = addtodate(yearago, 1, 'day');
elseif Nya == 7
yearago = addtodate(yearago, -1, 'day');
end
[NyaW, SyaW] = weekday(yearago)
The two refdate values put yearago on a Saturday or Sunday. The if block substitutes Friday for Saturday and Monday for Sunday. The yearago variable is the date number for that day.
Azzi Abdelmalek
Azzi Abdelmalek 2012-10-21
编辑：Azzi Abdelmalek 2012-10-21
use
[day_number,day]=weekday(datestr(now-365)) % date from now
or
dat=datenum('21-Sep-2012 21:36:20')
[day_number,day]=weekday(datestr(dat-365)) % date from any day
Now you have a number day, Sunday=1 Monday=2,... I don't know what do you mean by not working days, do you include days other then Sunday, like, Thanksgiving

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