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Re: idl readf error [message #65121]

Sat, 14 February 2009 06:35

Vince Hradil
Messages: 574
Registered: December 1999

Senior Member

On Feb 13, 10:17 pm, David Fanning <n...@dfanning.com> wrote:
> rollo.tom...@hotmail.com writes:
>> Here's what I have:
>
>> IDL> openr, 1, 'file1.out'
>> IDL> h = strarr(5)
>> IDL> readf, 1, h
>> IDL> close, 1
>> IDL> for j=0,4 do print, h[j]
>> T U 17.81 201 145225.9
>> T U 37.67 191 98975.8
>> T U 21.77 201 129774.9
>> T I 0.65 1 69.5
>> T I 0.36 1 69.3
>
>> By doing this I noticed that the values in the last column get pretty
>> large, so I changed the format to
>> format='(2A2, G7.2, G7.2, G10.2)'
>
>> And I still get the same error.
>
>> The largest values in the numerical columns are:
>> column 3: 272.23
>> column 4: 1000
>> column 5: 145225.9
>
> OK, well, as I expected, that format does not correspond
> to what is in the file. And I am still mystified as to
> why it worked (if it did) initially. The format looks to
> me to be something more like this:
>
> format='(2(A1,7x),F5.2,3x,I3,5x,G8.2)'
>
> Try that and see if you have better luck. :-)
>
> Here is the code I used to read the first line:
>
> IDL> openr, 1, file
> IDL> a="" &b = "" & c=0.0 & d=8 & e=0.0
> IDL> readf, 1, a, b, c, d, e, format='(2(A1,7x),F5.2,3x,I3,5x,G8.2)'
> IDL> print, a, b, c, d, e
> TU 37.6700 191 98975.8
>
> Cheers,
>
> David
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming:http://www.dfanning.com/
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")

This thread makes me think... Can anyone compare and contrast this
approach with the approach I usually use - that is:
read each line into a string buf: buf = '' $ readf, lun, buf
then use strsplit(buf,/extract) to chop up the buf
then use fix, float, etc. to get the values.

I don't usually use format statements for reading, just writing.

Thanks,
Vince

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[Message index]

		Re: idl readf error By: Vince Hradil on Sat, 14 February 2009 06:35
		Re: idl readf error By: David Fanning on Fri, 13 February 2009 20:17
		Re: idl readf error By: Chris[6] on Fri, 13 February 2009 16:59
		Re: idl readf error By: rollo.tomasi on Fri, 13 February 2009 15:54
		Re: idl readf error By: David Fanning on Fri, 13 February 2009 15:04
		Re: idl readf error By: rollo.tomasi on Fri, 13 February 2009 14:37
		Re: idl readf error By: David Fanning on Thu, 12 February 2009 12:19
		Re: idl readf error By: David Fanning on Sat, 14 February 2009 06:52

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