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Re: SPLIT numbers into sub-numbers [message #80577]

Sun, 24 June 2012 01:36

lecacheux.alain
Messages: 325
Registered: January 2008

Senior Member

On 22 juin, 21:52, k_ghr...@yahoo.com wrote:
> Dear all
> I would like to split the following number 20100115 into year, month
> and day
> any suggestions
> Thanks

The "IDL way" for extracting dates from such a coded integer array
might be:

IDL> dates = transpose([[x/10000],[(x mod 10000)/100],[x mod 100]])
in which dates will be an array of dimensions 3 x N_elements(x).

for instance:
IDL> x = [20100401, 20110501, 20120601]
IDL> print, transpose([[x/10000],[(x mod 10000)/100],[x mod 100]])
2010 4 1
2011 5 1
2012 6 1

A maybe more "readable", but slower way would be:

IDL> dates = intarr(3,N_elements(x)) ;you must define your output
first
IDL> reads, string(x, FORMAT='(i8)'), dates, FORMAT='(i4,i2,i2)'

or, if you like Julian days:

IDL> jd = dblarr(3,N_elements(x)) ;you must define your output
first
IDL> reads, string(x, FORMAT='(i8)'), jd,
FORMAT='(C(CYI4,CMOI2,CDI2))'
IDL> print,jd
2455288.0 2455683.0 2456080.0

alx.

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[Message index]

		Re: SPLIT numbers into sub-numbers By: lecacheux.alain on Sun, 24 June 2012 01:36
		Re: SPLIT numbers into sub-numbers By: k_ghreep on Sat, 23 June 2012 15:08
		Re: SPLIT numbers into sub-numbers By: Carsten Lechte on Sat, 23 June 2012 14:13
		Re: SPLIT numbers into sub-numbers By: k_ghreep on Sat, 23 June 2012 11:59
		Re: SPLIT numbers into sub-numbers By: k_ghreep on Sat, 23 June 2012 11:59
		Re: SPLIT numbers into sub-numbers By: Kenneth P. Bowman on Fri, 22 June 2012 18:45
		Re: SPLIT numbers into sub-numbers By: Michael Galloy on Fri, 22 June 2012 14:02

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