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Passing a GNUplot variable to system(/usr/bin/awk)

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  Passing a GNUplot variable to system(/usr/bin/awk) "Dan'l B" <dan.hinckley@gmail.com> - 2015-06-17 18:00 -0700
    Re: Passing a GNUplot variable to system(/usr/bin/awk) Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2015-06-20 01:43 +0200
      Re: Passing a GNUplot variable to system(/usr/bin/awk) "Dan'l B" <dan.hinckley@gmail.com> - 2015-06-20 07:58 -0700

#2937 — Passing a GNUplot variable to system(/usr/bin/awk)

This line in GNUplot works fine:

system("/usr/bin/awk '/-1.98/{print $2 $1}' /path/to/myfile.txt")

But how would I pass a variable from GNUplot into that in place of the -1.98 value? 

For example, using STATS_max_y from a plot command:

system("/usr/bin/awk '/STATS_max_y/{print $2 $1}' /path/to/myfile.txt")

That (and its variants) don't work, and I can't work out the formatting to do this correctly.

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#2945

Am 18.06.2015 um 03:00 schrieb Dan'l B:
> This line in GNUplot works fine:
>
> system("/usr/bin/awk '/-1.98/{print $2 $1}' /path/to/myfile.txt")
>
> But how would I pass a variable from GNUplot into that in place of the -1.98 value?

About the most straightforward way would probably be to use gnuplot's 
string manipulation functions to construct your awk command line, e.g.

	awkcommand = sprintf("/usr/bin/awk '/%f/{print $2 $1}' 
/path/to/myfile.txt", STATS_max_y)
	system(awkcommand)

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#2946

On Friday, June 19, 2015 at 7:43:13 PM UTC-4, Hans-Bernhard Bröker wrote:
> Am 18.06.2015 um 03:00 schrieb Dan'l B:
> > This line in GNUplot works fine:
> >
> > system("/usr/bin/awk '/-1.98/{print $2 $1}' /path/to/myfile.txt")
> >
> > But how would I pass a variable from GNUplot into that in place of the -1.98 value?
> 
> About the most straightforward way would probably be to use gnuplot's 
> string manipulation functions to construct your awk command line, e.g.
> 
> 	awkcommand = sprintf("/usr/bin/awk '/%f/{print $2 $1}'  /path/to/myfile.txt", STATS_max_y)
> 	system(awkcommand)

Perfect, many thanks, though the %g format works best for me here.

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