How to use str2num function to extract a specific year from the array?

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Ashfaq Ahmed
Ashfaq Ahmed 2022-7-8
回答： Star Strider 2022-7-8
Hi!
I have a column matrix consists of string arrays. It's a huge time matrix and I am just showing a part of it. It contains data from year 2001 to 2019.
'2003-09-30T20:32:34Z'
'2003-09-30T20:47:34Z'
'2003-09-30T21:02:34Z'
'2003-09-30T21:17:34Z'
'2003-09-30T21:32:34Z'
'2003-09-30T21:47:34Z'
'2003-09-30T22:02:34Z'
'2003-09-30T22:17:34Z'
'2003-09-30T22:32:34Z'
'2003-09-30T22:47:34Z'
'2003-09-30T23:02:34Z'
'2003-09-30T23:17:34Z'
'2003-09-30T23:32:34Z'
'2003-09-30T23:47:34Z'
'2004-05-23T13:45:00Z'
'2004-05-23T14:00:00Z'
'2004-05-23T14:15:00Z'
'2004-05-23T14:30:00Z'
'2004-05-23T14:45:00Z'
'2004-05-23T15:00:00Z'
'2005-05-23T15:15:00Z'
'2005-05-23T15:30:00Z'
'2005-05-23T15:45:00Z'
'2005-05-23T16:00:00Z'
'2005-05-23T16:15:00Z'
'2005-05-23T16:30:00Z'
'2006-05-23T16:45:00Z'
'2006-05-23T17:00:00Z'
'2006-05-23T17:15:00Z'
'2006-05-23T17:30:00Z'
'2006-05-23T17:45:00Z'
'2007-05-23T18:00:00Z'
If I want to extract only the data from 2003, how can I select those specific rows of 2003? I personally want to use this command -
str2num(time{i}(1:4))==2003
But if there is a better alternative, I am happy to use it! Thank you so much.

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采纳的回答

Star Strider
Star Strider 2022-7-8
Ran in:
C = {'2003-09-30T20:32:34Z'
'2003-09-30T20:47:34Z'
'2003-09-30T21:02:34Z'
'2003-09-30T21:17:34Z'
'2003-09-30T21:32:34Z'
'2003-09-30T21:47:34Z'
'2003-09-30T22:02:34Z'
'2003-09-30T22:17:34Z'
'2003-09-30T22:32:34Z'
'2003-09-30T22:47:34Z'
'2003-09-30T23:02:34Z'
'2003-09-30T23:17:34Z'
'2003-09-30T23:32:34Z'
'2003-09-30T23:47:34Z'
'2004-05-23T13:45:00Z'
'2004-05-23T14:00:00Z'
'2004-05-23T14:15:00Z'
'2004-05-23T14:30:00Z'
'2004-05-23T14:45:00Z'
'2004-05-23T15:00:00Z'
'2005-05-23T15:15:00Z'
'2005-05-23T15:30:00Z'
'2005-05-23T15:45:00Z'
'2005-05-23T16:00:00Z'
'2005-05-23T16:15:00Z'
'2005-05-23T16:30:00Z'
'2006-05-23T16:45:00Z'
'2006-05-23T17:00:00Z'
'2006-05-23T17:15:00Z'
'2006-05-23T17:30:00Z'
'2006-05-23T17:45:00Z'
'2007-05-23T18:00:00Z'};
DT = datetime(C, 'InputFormat','yyyy-MM-dd''T''HH:mm:ss''Z''', 'TimeZone','UTC') % Create 'datetime' Array
DT = 32×1 datetime array
30-Sep-2003 20:32:34 30-Sep-2003 20:47:34 30-Sep-2003 21:02:34 30-Sep-2003 21:17:34 30-Sep-2003 21:32:34 30-Sep-2003 21:47:34 30-Sep-2003 22:02:34 30-Sep-2003 22:17:34 30-Sep-2003 22:32:34 30-Sep-2003 22:47:34 30-Sep-2003 23:02:34 30-Sep-2003 23:17:34 30-Sep-2003 23:32:34 30-Sep-2003 23:47:34 23-May-2004 13:45:00 23-May-2004 14:00:00 23-May-2004 14:15:00 23-May-2004 14:30:00 23-May-2004 14:45:00 23-May-2004 15:00:00 23-May-2005 15:15:00 23-May-2005 15:30:00 23-May-2005 15:45:00 23-May-2005 16:00:00 23-May-2005 16:15:00 23-May-2005 16:30:00 23-May-2006 16:45:00 23-May-2006 17:00:00 23-May-2006 17:15:00 23-May-2006 17:30:00
Y2003 = year(DT) == 2003; % Logical Vector
Result = DT(Y2003)
Result = 14×1 datetime array
30-Sep-2003 20:32:34 30-Sep-2003 20:47:34 30-Sep-2003 21:02:34 30-Sep-2003 21:17:34 30-Sep-2003 21:32:34 30-Sep-2003 21:47:34 30-Sep-2003 22:02:34 30-Sep-2003 22:17:34 30-Sep-2003 22:32:34 30-Sep-2003 22:47:34 30-Sep-2003 23:02:34 30-Sep-2003 23:17:34 30-Sep-2003 23:32:34 30-Sep-2003 23:47:34
For table ‘T1’, the addressing would be:
Result = T1(Y2003,:)
to capture all the variables in ‘T1’ for those years.
.

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