Convert year into Matlab date format
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How can I convert the year into the matlab date format if I have a big data set? I have a table:
Year Data
1999
2000
2001 ...
3 个评论
Geoff Hayes
2018-5-5
Aoyi - do you want to convert these years into a serial date number (see datenum for details)? Or something else? Do you have a month and day or just the four digit year?
Aoyi
2018-5-5
Yes, datenum(*) datevector input syntax requires the minimum 3-vector [y,m,d] so can't pass just a numeric year. As you've discovered, the easy workaround is to simply augment with the 1,1 for the month,day.
The same idea as Ameer shows below also works for datenum just for the record; I recommend using datetime for new work; it has many advantages over the venerable datenum.
>> yr=[1999:2002].';
>> yr=datenum(num2str(yr),'yyyy');
>> datestr(yr)
yr =
4×11 char array
'01-Jan-1999'
'01-Jan-2000'
'01-Jan-2001'
'01-Jan-2002'
>>
You note datenum has introduced the 1,1 mo,da value anyway so may as well use the simpler form and go on.
(*) BTW, datetime is the same; it won't supply implicit default values for missing arguments (another enhancement, maybe(???) altho how much trouble is it to add a ',1,1' to the argument list, anyway? :) )
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Ameer Hamza
2018-5-5
If you have a numeric vector containing year numbers, you can convert a vector into a datetime array object as follow
myVector = 2000:2010
datetime(string(myVector), 'Format', 'yyyy')
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