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Re: Splitting An Array Of Strings Without Using Loops [message #35942 is a reply to message #35881]

Mon, 28 July 2003 11:47

Paul Van Delst[1]
Messages: 1157
Registered: April 2002

Senior Member

Darrick White wrote:
>
>> Dear Darrick,
>>
>> here is a second solution using reads.
>>
>> pro test
>> data=['1:23','2:32','3:30','4:45']
>>
>> s={x:bytarr(1),s:bytarr(1),y:bytarr(2)}
>> s=replicate(s,4)
>>
>> reads,byte(data),s
>>
>> print,string(s.x)
>> print,string(s.y)
>> end
>>
>> IDL> 1 2 3 4
>> IDL> 23 32 30 45
>
> It looks like I'm not explaining my problem clearly. For instance,
> the following sets of data are valid inputs to my application:
>
> 1) data=['1:23','2:32','3:30','4:45']
> 2) data=['12:23','22:32:34:45','32:30','42:45:90']
> 3) data=['100:23','200:32','300:30','400:45']
> 4) data=['1:23:2','2:32:2','3:30:2','4:45:2']
>
> The resulting transformation would like this for both:
>
> 1) print, intarr(2,4)
> 1 23
> 2 32
> 3 30
> 4 45
>
> 2) print, intarr(4,4)
> 12 23 NaN NaN
> 22 32 34 45
> 32 30 NaN NaN
> 42 45 90 NaN

Wouldn't this need to be a two-pass problem? You parse the input data to
determine the individual entry and maximum dimension (in this case 4 due to the
22:32:34:45), create you array with fill values, and then "go through the array
once more" to fill in your array. (The quotes are there because going through
the array once more could be achieved a number of ways.)

I would think that smart usage of the IDL string functions should be able to do
most of that sans looping. (Otherwise, I'm sure JD can come up with some neato
supa-quick method using HISTOGRAM.... :o)

paulv

p.s. If you're only using integers, you can't use NaN as a fill value.

--
Paul van Delst
CIMSS @ NOAA/NCEP/EMC
Ph: (301)763-8000 x7748
Fax:(301)763-8545

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[Message index]

		Splitting An Array Of Strings Without Using Loops By: darrick.white on Thu, 24 July 2003 21:42
		Re: Splitting An Array Of Strings Without Using Loops By: Pavel Romashkin on Tue, 29 July 2003 11:10
		Re: Splitting An Array Of Strings Without Using Loops By: JD Smith on Tue, 29 July 2003 09:24
		Re: Splitting An Array Of Strings Without Using Loops By: Pavel Romashkin on Tue, 29 July 2003 08:46
		Re: Splitting An Array Of Strings Without Using Loops By: JD Smith on Mon, 28 July 2003 16:00
		Re: Splitting An Array Of Strings Without Using Loops By: Paul Van Delst[1] on Mon, 28 July 2003 11:47
		Re: Splitting An Array Of Strings Without Using Loops By: Rick Towler on Mon, 28 July 2003 11:24
		Re: Splitting An Array Of Strings Without Using Loops By: David Fanning on Mon, 28 July 2003 10:23
		Re: Splitting An Array Of Strings Without Using Loops By: darrick.white on Mon, 28 July 2003 10:17
		Re: Splitting An Array Of Strings Without Using Loops By: R.Bauer on Sat, 26 July 2003 04:10

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