Re: [Gnuplot-info] Storing point from data file in variable

[Thomas S. <t.s...@fz...>]

get 1st data of column 3:

x1 = system("head -n1 datafilename | cut -d ' ' -f 3")
or
x1 = system("head -n1 ts.dat | awk '{print $3}'")

or with gnuplot 4.3-cvs:

set table
plot 'datafilename' us 0:($0==0?(x1=$3):$3)
unset table


Jeremy Conlin wrote:
> 
> I have a file containing all my data.  I can  easily plot that data.  I
> need
> to store the first data point in a particular column so I can place a
> label
> at that point.  Can someone show me how to do this?
> Small example:
> # ----------------------------------
> x1 = # Get data from file
> y1 = 1.0
> 
> set label "Hello" at x1, y1 right
> # -----------------------------------
> 
> Thanks,
> Jeremy
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