Having difficulty filtering data and extracting some information from data.

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Mate 2u 2013 年 4 月 15 日
Dear all, I have a 1x3 Cell. In these 3 cells I have:
Column 1 (cell 600000 x 1), with dates in the form of mm/dd/yyyy
Column 2 (Single 600000 x 1), with prices.
Column 3 (uint16 600000 x 1) with trades.
I want to do the following:
1) Delete all entries which are not in 2008 (Delete the rest due to memory restrictions of making more matrixes/arrays)
2) Once I have all the data for 2008, I would like to store in a separate array the Last price for each day within 2008.
3) For 2008, I would like to store in a separate array the number of prices for everyday (there are uneven intervals).
4) Lastly for 2008, I would like to store in a seperate array the sum of trades everyday.
Therefore (2) and (3) will all be the same size.
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Mate 2u 2013 年 4 月 15 日
Column 1: '09/10/2007' '09/10/2007' '09/10/2007'
Column 2: 12541 12541 12545
Column 3: 1 1 1
Mate 2u 2013 年 4 月 15 日
segarray is our 1x3 cell with all the data
DateVector=datevec(segarray{1,1});
for i = 1:length(DateVector)
if DateVector(i,1) ~= 2008
segarray{1,1}(i,1)=[];
segarray{1,2}(i,1)=[];
segarray{1,3}(i,1)=[];
end
end
I thought this will solve 1) but no it doesn't.

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回答 (1 件)

Sean de Wolski 2013 年 4 月 15 日

Use datevec on your date string to idenitfy the year. Then use logical indexing to discard everything that is not in 2008.
doc datevec

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