best way to search date in vector

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Alina 2011-6-29

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hello,

i have a vector of numerical dates that repeat but not in a specific order. i need to search for all dec 1984 then do some things then search for all dec 1985 and do some things and so on until dec 2010. what is the easiest way to do it? i tried converting to string date and then concatenate but it takes too long. any suggestion on what is the best way?

many thanks, a

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Answer 1

Andrei Bobrov 2011-6-29

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https://ww2.mathworks.cn/matlabcentral/answers/10494-best-way-to-search-date-in-vector#answer_14443

在 MATLAB Online 中打开

dev = datevec(dateinput);
dateout = sortrows(dev(dev(:,2)==12,1:3),1)

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Answer 2

Jan 2011-6-29

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https://ww2.mathworks.cn/matlabcentral/answers/10494-best-way-to-search-date-in-vector#answer_14445

在 MATLAB Online 中打开

date_numbers = [733588.513, 733688.513, 733788.513];
date_vector = datevec(date_numbers);
for year = 1984:2010
  index = and(date_vector(:, 1) == i, date_vector(:, 2) == 12);
  % Now "index" is the LOGICAL index, which is 
  % very efficient usually for selecting data.
  % Perhaps "find(index)" is useful also.
end

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Answer 3

Krishna Kumar 2011-6-29

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With the description you've given, seems 'find' will do it fine- x=find(vector==1984). Seems you want to do sth like a loop- for ind=1984:2010 x=find(vector==ind); %%Your statements%% end

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Alina 2011-6-29

thanks but the problem is the stings is saved as a nx11 matrix (basically one cell for each character in 30-Dec-1984). if i try to concatenate this it takes too long, as n is large.

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