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List:       gnuplot-info
Subject:    Re: [Gnuplot-info] Label value from file and caption under the graph
From:       Hans-Bernhard_Bröker <broeker () physik ! rwth-aachen ! de>
Date:       2006-08-07 19:38:59
Message-ID: 44D796D3.5050909 () physik ! rwth-aachen ! de
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fusselpelusa wrote:
> Hi,
> I have a problem with labelling my plots at an arbitrary position (set label
> "... %f" '???filename and column/line???' at ....) using values from a file.

That's not surprising --- you can't do that.  Gnuplot reads data from 
outside files only in the {re|s|}plot commands.  If you want to extract 
a single piece of data from a file, you have to do that outside gnuplot, 
and feed the result back into it as a command.  The version-4.0 trick of
'set label "foo = %f", foo' works only for gnuplot-internal, numeric 
variables, not for arbitrary data from external files.

If you want to extract lots of data from a file, wait for the 4.2 
release and then use 'plot "file" with labels'

> Anyway, as the value I would like to be as label is not the only
> one in the line of my data file, perhaps awk will not work? 

It will.  You're badly underestimating awk.  someone once wrote an 
entire multi-targeting macro assembler in awk.

> Additionally I would like to implement underneith the plot a few lines of
> text from another textfile like a caption, is this possible with gnuplot? 

Possible, sure (generate a multi-line 'set ylabel' or several 'set 
label' commands from it), but rarely advisable.  If you want a caption, 
do it outside gnuplot, in the document processing system you're putting 
that plot in.



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