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Re: reading an ascii file efficiently [message #68910 is a reply to message #68905]

Fri, 27 November 2009 14:45

penteado
Messages: 866
Registered: February 2018

Senior Member
Administrator

On Nov 27, 5:02 pm, nata <bernat.puigdomen...@gmail.com> wrote:
> Hi all,
>
> Thanks for your suggestions. Finally, the fastest read time for this
> situation is the following one:
>
> lines=FILE_LINES(file)
> rr=STRARR(lines)
> OPENR, lun, file, /GET_LUN
> READF, lun, rr
> FREE_LUN, lun
>
> result=FLTARR(lines)
> FOR i=0l, lines-1 DO BEGIN
> str_arr=STRSPLIT(rr[i],',',/EXTRACT)
> result[i]=FLOAT(str_arr[6])
> ENDFOR
>
> It's just 0.4 seconds faster than the previous solution. Thanks,
> anyway
>
> nata

Another option, in IDL 7.1, is read_csv. It would take just one line
to write:

result=(read_csv(file)).(6)

With no need to open or close the file yourself, find out its length,
or declare the result variable.

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[Message index]

		Re: reading an ascii file efficiently By: jeanh on Mon, 30 November 2009 06:50
		Re: reading an ascii file efficiently By: natha on Mon, 30 November 2009 06:39
		Re: reading an ascii file efficiently By: David Fanning on Sat, 28 November 2009 11:00
		Re: reading an ascii file efficiently By: penteado on Fri, 27 November 2009 21:04
		Re: reading an ascii file efficiently By: David Fanning on Fri, 27 November 2009 20:56
		Re: reading an ascii file efficiently By: penteado on Fri, 27 November 2009 19:58
		Re: reading an ascii file efficiently By: Heinz Stege on Fri, 27 November 2009 19:27
		Re: reading an ascii file efficiently By: Heinz Stege on Fri, 27 November 2009 19:16
		Re: reading an ascii file efficiently By: penteado on Fri, 27 November 2009 14:45
		Re: reading an ascii file efficiently By: natha on Fri, 27 November 2009 11:02
		Re: reading an ascii file efficiently By: jeanh on Fri, 27 November 2009 10:39
		Re: reading an ascii file efficiently By: b_gom on Fri, 27 November 2009 10:34

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