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Add zeros to some dates

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djr
djr on 2 Aug 2014
Edited: Andrei Bobrov on 2 Aug 2014
Hi,
I have a file with dates that are in the format 'yymmdd'. For example, 991231 would be Dec 31st, 1999. However when it gets into 2000, the dates in the file are missing zeros before the first non-zero number. For instance, 410 stands for April 10th, 2000. Therefore, I have problems to cnevert it into the Matlab date format.
The file is in txt format so I opened it like this:
fid = fopen('ki2_out_acyc.txt');
acyc = textscan(fid, '%s');
fclose(fid);
The following functions do not work because it cannot recognize dates that are missing zeros:
ACdate = cellfun(@(x) datenum(x,'yymmdd'), acyc)
ACdata = datenum(acyc{1}, 'yymmdd')
ACdate = datenum(acyc{1})
I guess I have to add zeros to the dates that lack zeros. I have very large set of data so I cannot do it manualy.
Please could you help me with this? Thanks, Djordje

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dpb
dpb on 2 Aug 2014
It seems otomh there could be ambiguous cases here, maybe? But perhaps they can be disambiguated by the files (presumably) being in sequence?
Anyway, just thinking at it, seems as you'll have to have a function that looks at the length of the string and inserts appropriately depending on that (and perhaps the preceding value). The case of three digits is, I think clearcut that for that case
>> d='410';
>> num2str(sscanf(d,'%1d').','%02d')
ans =
040100
>>
is a valid fixup; you'll need appropriate caveats on the cases for four and five digits in length.
Is there any chance you could simply regenerate the file(s) and fix the formatting there instead?
djr
djr on 2 Aug 2014
Attached is the file. Dates are in the first column.
djr
djr on 2 Aug 2014
I need the following format:
000410 for April 10th, 2000.

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Accepted Answer

Azzi Abdelmalek
Azzi Abdelmalek on 2 Aug 2014
fid = fopen('file.txt');
acyc = textscan(fid, '%s');
fclose(fid);
w=cellfun(@(x) [repmat('0',1,6-numel(x)) x],acyc{:},'un',0)
ACdate = cellfun(@(x) datenum(x,'yymmdd'),w)

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Azzi Abdelmalek
Azzi Abdelmalek on 2 Aug 2014
acyc=dlmread('ki2_out_acyc.txt')
d=arrayfun(@num2str,acyc(:,1),'un',0)
w=cellfun(@(x) [repmat('0',1,6-numel(x)) x],d,'un',0)
ACdate = cellfun(@(x) datenum(x,'yymmdd'),w)

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More Answers (2)

Andrei Bobrov
Andrei Bobrov on 2 Aug 2014
Edited: Andrei Bobrov on 2 Aug 2014
out = datenum(cellfun(@(x)sprintf('%06s',x),acyc{:},'un',0),'yymmdd');
right variant
f = fopen('ki2_out_acyc.txt');
c = textscan(f,'%s %d %d %f %f %f %f %f','CollectOutput',1);
fclose(f);
out = datenum(cellfun(@(x)sprintf('%06s',x),c{1},'un',0),'yymmdd');
a1 = (out - now) > 0;
out(a1) = arrayfun(@(x)addtodate(x,-100,'year'),out(a1));

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djr
djr on 2 Aug 2014
Thanks guys... Both answers worked. Thanks so much!!!

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