Groups > comp.graphics.apps.gnuplot > #3659

Re: skipping values in a data file

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Subject	Re: skipping values in a data file
From	"hugocoolens@gmail.com" <hugocoolens@gmail.com>
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Op donderdag 1 juni 2017 23:26:46 UTC+2 schreef Ethan A Merritt:
> hugocoolens@gmail.com wrote:
> 
> > I have a data file with measurements, each measurement has been repeated 5
> > times. However because of a bug in the apparatus software the first and
> > the second measurement are always unreliable, therefore I want to skip
> > them i.e. I don't want to plot these unreliable data points, neither do I
> > want to use them for fitting to a function. This is an example: 1
> > #unreliable 1.5 #unreliable 3 #reliable
> > 3.1 #reliable
> > 2.9 #reliable
> > #start of next 5 measurements:
> > 3 #unreliable
> > 3.1 #unreliable
> > 3.5 #reliable
> > 3.4 #reliable
> > 3.6 #reliable
> > 
> > Can anyone here show me how to do is from within Gnuplot?
> > kind regards,
> > Hugo
> 
> If it is always the first two measurements in the file, you can add "skip 2"
> to the plot or fit statement:
> 
>     plot "foo" skip 2 using 0:1
> 
> However your sample above seems to show that that there are multiple blocks
> of data in the file and in each block the first 2 records are bad.
> For this you could instead use
> 
>     plot "foo" every ::2 using 0:1
> 
> But note that you need a blank line between the data blocks for this to work
> (otherwise gnuplot does not know that new block of data is starting).
> 
> See "help every"
> 
> 	Ethan

Thanks a lot for the reply. Adding an extra blank line is no too difficult. Can I also use the "every" syntax in a fit statement? Could you provide an example?

kind regards,
Hugo

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Thread

skipping values in a data file "hugocoolens@gmail.com" <hugocoolens@gmail.com> - 2017-06-01 08:47 -0700
  Re: skipping values in a data file Ethan A Merritt <sfeam@users.sourceforge.net> - 2017-06-01 14:26 -0700
    Re: skipping values in a data file "hugocoolens@gmail.com" <hugocoolens@gmail.com> - 2017-06-02 02:39 -0700
      Re: skipping values in a data file Ethan A Merritt <sfeam@users.sourceforge.net> - 2017-06-02 13:25 -0700
        Re: skipping values in a data file "hugocoolens@gmail.com" <hugocoolens@gmail.com> - 2017-06-03 11:31 -0700

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