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Re: Reading in text data [message #21099 is a reply to message #21098]

Tue, 08 August 2000 00:00

Andy Loughe
Messages: 174
Registered: November 1995

Senior Member

reardonb@my-deja.com wrote:
>
> Hi. I am reading in text data (columns and rows of numbers) and I would
> like to know if there is a more elegant way of doing it. Currently, the
> user must specify how many columns there are. In my case the number of
> columns is manually inserted into the first line of the file like this:
>
> 3
> 0 1 2
> 1 2 3
> 2 3 4
> 3 4 5
> 4 5 6
> 5 6 7
> 6 7 8
> 7 8 9
> 8 9 10
> 9 10 11

There are lots of ways to attack this problem depending upon
whether you need to operate on the data one-row-at-a-time, or
if you need all the data stored into an array. Some potentially
useful ideas are illustrated in this simple procedure...

infile = 'column.dat' ;** ASCII input filename.
spawn, 'wc -l < ' + infile, num_recs ;** Number of rows in ASCII file
num_recs = long(num_recs(0)) ;** Convert to num_recs to LONG
data = strarr(num_recs) ;** Declare output array
openr, iu, infile, /get_lun ;** Open file
readf, iu, data ;** Real ALL the data as a string
free_lun, iu ;** Close the file

;** Use help, to check size of arrays. Notice record #1.
for i = 0, num_recs-1 do help, long(str_sep(data(i),' ',/rem))

;** Or use print, to check on value of array elements.
for i = 0, num_recs-1 do print, long(str_sep(data(i),' ',/rem))

end

--
Andrew Loughe =====================================================
NOAA/OAR/FSL/AD R/FS5 | email: loughe@fsl.noaa.gov
325 Broadway | wwweb: www-ad.fsl.noaa.gov/users/loughe
Boulder, CO 80305-3328 | phone: 303-497-6211 fax: 303-497-6301

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[Message index]

		Re: Reading in text data By: reardonb on Wed, 09 August 2000 00:00
		Re: Reading in text data By: Paul van Delst on Wed, 09 August 2000 00:00
		Re: Reading in text data By: R.Bauer on Wed, 09 August 2000 00:00
		Re: Reading in text data By: Craig Markwardt on Tue, 08 August 2000 00:00
		Re: Reading in text data By: Andy Loughe on Tue, 08 August 2000 00:00
		Re: Reading in text data By: davidf on Tue, 08 August 2000 00:00

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