Extracting index of specified date from datetime array

Question

Sreeraj T 2021-5-12

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/827995-extracting-index-of-specified-date-from-datetime-array

评论： Walter Roberson 2023-3-22

采纳的回答： Walter Roberson

Let us say that I have a datetime array which has dates that goes like these:

'2015-05-03 23:59:56'

'2015-05-03 23:59:57'

Now, I would like to know the indices of one certain element, say {'2015-05-03 23:59:57'}. How can I get that?

I tried with example given in https://in.mathworks.com/help/finance/datefind.html, but even for the example given there is not getting executed in my pc. It is giving an error ‘Undefined function 'datefind' for input arguments of type 'double'.’. I suspect that it may be due to not having the proper toolbox. The toolbox that I am having are:

Curve Fitting Toolbox, Parallel Computing Toolbox, Partial Differential Equation Toolbox, Signal Processing Toolbox and Symbolic Math Toolbox

Thanks in advance.

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Answer 1

Walter Roberson 2021-5-12

3
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/827995-extracting-index-of-specified-date-from-datetime-array#answer_697840

在 MATLAB Online 中打开

S = datetime({'2015-05-03 23:59:56'
'2015-05-03 23:59:56'
'2015-05-03 23:59:56'
'2015-05-03 23:59:56'
'2015-05-03 23:59:57'
'2015-05-03 23:59:57'
'2015-05-03 23:59:57'
'2015-05-03 23:59:57'
'2015-05-03 23:59:57'
'2015-05-03 23:59:57'
'2015-05-03 23:59:57'
'2015-05-03 23:59:57'})
S = 12×1 datetime array
   03-May-2015 23:59:56
   03-May-2015 23:59:56
   03-May-2015 23:59:56
   03-May-2015 23:59:56
   03-May-2015 23:59:57
   03-May-2015 23:59:57
   03-May-2015 23:59:57
   03-May-2015 23:59:57
   03-May-2015 23:59:57
   03-May-2015 23:59:57
   03-May-2015 23:59:57
   03-May-2015 23:59:57
probe = datetime('2015-05-03 23:59:57')
probe = datetime
   03-May-2015 23:59:57
find(S == probe)
ans = 8×1
     5
     6
     7
     8
     9
    10
    11
    12