the conversion from data string to serial number

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I have to convert from string (cell) to serial number but it's slow..is there a faster method?

formatin='dd/mmm/yyyy';

for i = 1:length(TabStrum_Nome)

dataa(:,i)=datenum(A.textdata,formatin);

end

>> class(A.textdata)

ans =

'cell'

>>

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shamal 2023-5-12

sorry.. i changed the question because the previous one i solved it

shamal 2023-5-12

sorry but the notification that someone had answered me arrived late..in the meantime I had solved the problem

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Answer 1

Stephen23 2023-5-12

编辑：Stephen23 2023-5-12

在 MATLAB Online 中打开

0 个投票

Yes, that is the wrong date.... it is also the wrong data type: why are you using deprecated serial date numbers?

The DATENUM documentation states at the top:

C = compose('%02d/01/2008',(1:10).')
C = 10×1 cell array
    {'01/01/2008'}
    {'02/01/2008'}
    {'03/01/2008'}
    {'04/01/2008'}
    {'05/01/2008'}
    {'06/01/2008'}
    {'07/01/2008'}
    {'08/01/2008'}
    {'09/01/2008'}
    {'10/01/2008'}
N = datenum(C,'dd/mm/yyyy')
N = 10×1
      733408
      733409
      733410
      733411
      733412
      733413
      733414
      733415
      733416
      733417

checking:

datestr(N)
ans = 10×11 char array
    '01-Jan-2008'
    '02-Jan-2008'
    '03-Jan-2008'
    '04-Jan-2008'
    '05-Jan-2008'
    '06-Jan-2008'
    '07-Jan-2008'
    '08-Jan-2008'
    '09-Jan-2008'
    '10-Jan-2008'

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shamal 2023-6-4

编辑：shamal 2023-6-4

HI, i ak you a question:

if i want to use only date (not date and time) you always advise me to use the 'format' datetime ?

(I don't care to use the time but only the dates)

Stephen23 2023-6-5

"if i want to use only date (not date and time) you always advise me to use the 'format' datetime ?"

That depends entirely on what you mean by "use", which you have not explained.

Changing the DATETIME format changes how it displays/converts to text, but does not change the value of the DATETIME object itself. So if you want e.g. to compare DATETIME values or group them, it doesn't have any effect.

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the conversion from data string to serial number

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