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Skip line in reading a file [message #71018]

Tue, 25 May 2010 23:54

Fred[1]
Messages: 4
Registered: April 2010

Junior Member

Hi to everybody,
I need to read a file of n columns "namefile", but also I need to
select only the lines where the variable in column 3, i.e. [2,*], for
example, has value larger than X.
I tried this way:

n1=numlines(namefile)

OPENR, 1, namefile
aaa=fltarr(col,n1)
readf,1,aaa
close,1

aa = REFORM(aaa[2,*])
if aa[2,*] gt X then a[*,*] = aaa[*,*]

The array a should be an array a[col,n2], where n2 is the number of
the lines where aa[2,*] gt X.
But
help,/st,a
gives an array with columns=col and lines=n1!!!
So it completes the routine without errors but does not select the
lines where aa[2,*] gt X.
I could not use Skipline of readcol, because it skips only the first
line. There should be an easy way to do it.
Thanks

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[Message index]

		Skip line in reading a file By: Fred[1] on Tue, 25 May 2010 23:54
		Re: Skip line in reading a file By: mankoff on Wed, 26 May 2010 00:34
		Re: Skip line in reading a file By: penteado on Wed, 26 May 2010 00:30

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