Re: [Gnuplot-info] data operations on multiple data files in gnuplot

[Hans-Bernhard B. <HBB...@t-...>]

baalkikhaal wrote:

> i want to perform a summation of column 2 of each of given set of data files
> and then plot the sum against the common column 1

It may be possible to do such things inside gnuplot these days (using 
the CVS version, or 4.4 once that becomes a reality), but I think you 
should do this outside.  Command-line tools like 'paste', 'join' and 
'awk' should work just fine here.  Basically:

	while there are more than 1 files left:
	  paste lastfile nexttolastfile | \
           awk '{print $1, "\t", $2+$4}' > new_lastfile
           mv new_lastfile nexttolastfile

With a more complex script, awk could do the entire job.