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Re: TRICKY TASK USING AWK [message #92793 is a reply to message #92791]

Mon, 29 February 2016 09:44

wlandsman
Messages: 743
Registered: June 2000

Senior Member

On Monday, February 29, 2016 at 11:58:32 AM UTC-5, Sapna Mishra wrote:
> Actually I want to grep a particular column say column 2 from fname[i] and want to save it to fnameo[i] as an output. In IDL I don't know how to read any file having unknown numbers of columns because in READCOL to read file we need to mention a variable for each column in which particular column will get stored.

Here is a short IDL program to read the number of columns in a file, e.g.
ncol = findnumcol('myfile.dat')

function findnumcol, file
; Return the number of columns of data in a file
; Just reads the first line and assume rest of the file
; is the same. Could add code to skip header lines
openr,lun,file,/get_lun
st = ''
readf,lun,st
free_lun,lun
tmp = strsplit(st,count=ncol)
return,ncol
end

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[Message index]

		TRICKY TASK USING AWK By: Sapna Mishra on Fri, 26 February 2016 01:20
		Re: TRICKY TASK USING AWK By: dg86 on Fri, 26 February 2016 04:03
		Re: TRICKY TASK USING AWK By: Sapna Mishra on Fri, 26 February 2016 06:55
		Re: TRICKY TASK USING AWK By: Mats Löfdahl on Fri, 26 February 2016 07:09
		Re: TRICKY TASK USING AWK By: Sapna Mishra on Mon, 29 February 2016 07:57
		Re: TRICKY TASK USING AWK By: Paul Van Delst[1] on Mon, 29 February 2016 08:07
		Re: TRICKY TASK USING AWK By: Heinz Stege on Mon, 29 February 2016 09:33
		Re: TRICKY TASK USING AWK By: Sapna Mishra on Mon, 29 February 2016 08:58
		Re: TRICKY TASK USING AWK By: wlandsman on Mon, 29 February 2016 09:44
		Re: TRICKY TASK USING AWK By: Sapna Mishra on Mon, 29 February 2016 22:08
		Re: TRICKY TASK USING AWK By: wlandsman on Tue, 01 March 2016 07:39
		Re: TRICKY TASK USING AWK By: wlandsman on Tue, 01 March 2016 19:36
		Re: TRICKY TASK USING AWK By: Sapna Mishra on Mon, 29 February 2016 22:12
		Re: TRICKY TASK USING AWK By: Mats Löfdahl on Tue, 01 March 2016 01:37
		Re: TRICKY TASK USING AWK By: Mats Löfdahl on Tue, 01 March 2016 01:50

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