[Gnuplot-info] Dynamic labels

[Dave H. <da...@ho...>]

Continuing in my quest to push Gnuplot to its limits, I'd like to be able 
to set the title of a graph to the dates of the first and last data.  I'm 
envisaging something like:

    set title "Plot of Blah\nFrom $first to $last\n(Use at own risk)"

etc, where $first and $last are set from the first and last data lines.  
I know that I can get this by reading the x-axis itself, but it's a bit 
cleaner if it's part of the multi-line title.

Not knowing the innards of Gnuplot, I'm hoping that the title can be 
printed dynamically in the first place, so a Small Matter Of 
Programming(tm) should extract what I want, if possible.

Something like:

    Grab first date => $first.
    Keep reading until EOF.
    Grab last date => $last.
    sprintf("Plot of Blah\nFrom %s to %s", $first, $last) into title.
    Plot.

(My next question will be whether it's possible to print the names of the 
script and data files, when I print the graph date; I'm a data-driven sort 
of guy.)

-- Dave