Re: [Gnuplot-info] Plot command with '-' and '' using same data

[Ethan A M. <eam...@gm...>]

On Thursday, 23 January 2014 01:07:39 AM Tait wrote:
> The '' syntax re-uses the file name, not the file data. With a normal
> file the '' actually re-reads the file again, which is why when gnuplot
> goes to re-read from inline you must re-supply the data. To reuse the
> file's data, gnuplot would obviously have to cache it, and that is
> impractical or impossible for large data sets.
> 
> I think I recall some discussion along the lines of implementing a named
> data store feature that would explicitly instruct gnuplot to cache a
> particular (potentially inline) data set, but I'm not sure whether it
> was completed.

Correct.
In 4.7 you can provide named data blocks.

gnuplot> help inline
 There are two mechanisms for embedding data into a stream of gnuplot commands.
 If the special filename '-' appears in a plot command, then the lines
 immediately following the plot command are interpreted as inline data.
 See `special-filenames`.  Data provided in this way can only be used once, by
 the plot command it follows.

 The second mechanism defines a named data block as a here-document.  The named
 data is persistent and may be referred to by more than one plot command.
 Example:
      $Mydata << EOD
      11 22 33 first line of data
      44 55 66 second line of data
      # comments work just as in a data file
      77 88 99
      EOD
      stats $Mydata using 1:3
      plot $Mydata using 1:3 with points, $Mydata using 1:2 with impulses

 Data block names must begin with a $ character, which distinguishes them from
 other types of persistent variables.  The end-of-data delimiter (EOD in the
 example) may be any sequence of alphanumeric characters.

               Ethan


> 
> To only type in the data once, put it into a regular file with the
> appropriate format, and reference it by its file name.
> 
> Theo <th...@gm...> said (on 2014/01/22):
> > Hi there,
> > 
> > if I want to include (for some special reason) data into the plotting 
> > file itself I can use the special filename '-' and write the data in the 
> > plot file...
> > 
> > Why can't I use the same data twice? Can anybody explain?
> > Is there a way that I have to type in the data only once?
> 
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