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Re: Read Total lines in an ASCII file [message #33174 is a reply to message #33172]

Fri, 13 December 2002 10:08

David Burridge
Messages: 33
Registered: January 1998

Member

Hi Maria,

Actually, I beleive there is a new feature in IDL 5.6 that does this. But
assuming you're still on IDL 5.5, something like:

noLines = 0L
line = ''
OpenR, lun, 'mytextfile.txt', /Get_lun
While Not EOF (lun) Do Begin
ReadF, lun, line
noLines = noLines + 1
EndWhile

Will do the trick. If (as I suspect) you then want to read the file, don't
forget to:

Point_Lun, lun, 0

before you do. Otherwise, you'll need a:

Free_Lun, lun

to close the file and make the allocated file unit available to IDL again.

On the other point, will a simple:

mychar EQ 'P'

in a statement do the trick? Examples

If mychar EQ 'P' Then Print, 'Hello'

mybool = mychar EQ 'P'

Hope this helps.

Best regards,

David

David Burridge

Burridge Computing

18 The Green South

Warborough

Oxon

OX10 7DN

Tel: 01865 858279

Mobile: 0780 244 1748

Email: davidb@burridgecomputing.co.uk

"Maria" <msmimb@hotmail.com> wrote in message
news:d19b702e.0212130942.1d6d6dbf@posting.google.com...
> I bet my question seems simple to all of you but...does anybody know
> how to read the total number of lines in an ASCII file?
>
> Also, is there any command in IDL such as if ( variable_char is char)
> then give me a boolean (true or false)?
>
> Thanks a lot!
> Maria.

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[Message index]

		Re: Read Total lines in an ASCII file By: David Fanning on Fri, 13 December 2002 10:53
		Re: Read Total lines in an ASCII file By: Med Bennett on Fri, 13 December 2002 10:39
		Re: Read Total lines in an ASCII file By: David Burridge on Fri, 13 December 2002 10:08
		Re: Read Total lines in an ASCII file By: Mark Hadfield on Sun, 15 December 2002 13:09
		Re: Read Total lines in an ASCII file By: wmconnolley on Fri, 13 December 2002 14:42

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