| Re: ASCII data with 5000 columns [message #14604 is a reply to message #14598] |
Thu, 11 March 1999 00:00  |
Martin Schultz
Messages: 515
Registered: August 1997
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Senior Member |
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R.Bauer wrote:
>
> Hi,
>
> how to read an ASCII datafile with 5000 data coloumns.
> The length of each line is about 56400 characters or longer.
>
> reads, readf don't work because the max stringlenth is exceeded.
>
> The only way I know to read is readu.
> I separate the numbers in the byte array convert them to string and at
> last to
> float.
>
> It's a bit unbelievable that's idl is able to handle more than 2 Giga
> Byte but only if they are organized by rows and a few columns.
>
> R.Bauer
Hallo Reimar,
maybe you can use string arrays and the format statement? Here's an
example:
a=replicate('*',62000L)
b=string(a,format='(32000A1)')
will give you a two-element string array.
Even better of course to have a formatted file where you can assign the
format statement to individual tags (e.g. 5000A8)
try: c=strarr(5000)
readf,ilun,c,format='(5000A8)'
Hoffe, das hilft,
Viele Gruesse,
Martin.
--
------------------------------------------------------------ -------
Dr. Martin Schultz
Department for Engineering&Applied Sciences, Harvard University
109 Pierce Hall, 29 Oxford St., Cambridge, MA-02138, USA
phone: (617)-496-8318
fax : (617)-495-4551
e-mail: mgs@io.harvard.edu
Internet-homepage: http://www-as.harvard.edu/people/staff/mgs/
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