Finding unique dates in vector
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Hi all.
I have a vector of dates where each date is repeated many times. How would i create a vector with every date but no repetitions efficiently?
Thx.
1 个评论
Jan
2011-5-25
What exactly means "vector of dates"? Please post the type of the input exactly. I assume that UNIQUE will help you directly.
采纳的回答
Andrei Bobrov
2011-5-25
Date = ['02-Aug-2010 19:28:01'
'13-Nov-2010 09:10:20'
'10-Nov-2010 14:44:14'
'02-Aug-2010 19:28:01'
'08-Oct-2010 08:58:46'
'30-Jan-2010 08:24:16'
'10-Nov-2010 14:44:14'
'13-Nov-2010 09:10:20'
'08-Oct-2010 08:58:46']
[a n] = unique(datenum(Date));
D1 = sortrows([a n],2);
Dout = datestr(D1(:,1));
Hi Jan! agree with you. In our case, it is possible and so:
[a n] = unique(Date,'rows')
[~,idx] = sort(n);
Dout = a(idx,:);
4 个评论
Jan
2011-5-25
What about "unique(cellstr(Date))"?
Mads
2011-5-25
Andrei Bobrov
2011-5-25
Hi Jan! agree with you.
Matt Tearle
2011-5-25
...assuming that the dates are all in the exact same format. Andrei's solution (going via datenum) avoids the problem of two different formats for the same date. (Unlikely, but it could happen.)
更多回答（1 个）
Daniel Svedbrand
2025-3-12
编辑：Daniel Svedbrand
2025-3-12
0 个投票
unique_dates = unique(dateshift(Date,'start','day'));
if Date are datetimes, otherwise
unique_dates = unique(dateshift(datetime(Date),'start','day'));
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