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I've just been looking at graphing packages. Have you seen this one? http://matplotlib.sourceforge.net/ Powerful stuff. And if you want graphs (directed, acyclic and the like) there is https://networkx.lanl.gov/wiki/pygraphviz I've been bogged down with automating graphs using OpenOffice / uno / pyuno, which is pretty grim. Much better off with the above. Surely the good thing about Perl and friends, is that they make it easy to juggle with the data sets before you plot them? D On Thursday 03 January 2008 17:58:41 Steve Marvell wrote: > Mostly from Perl as it happens, but ... > > Why are graphing packages that plot mulitple lines obsessed with all > the Y data sets having a common X data set. > > I need to plot chronological age against reading age, which is easy > enough, I have data like: > > 6y 3m (6.25) , 6y 6m, (6.5) > 7y 6m (7.5) , 8y 0m, (8) > > all nicely paired, but not necessarily whole numbers. Nice easy line plot. > > I also want an equivalency line (y=x), but I don't want to plot > (6.25,6.25) and (7.5,7.5) I want to plot (6,6),(7,7),(8,8). But no, I > have only one X data set! > > It seems that most graphers want the data to be of the form: > > @x,@y1,@y2,@y3,... > > How annoying is that! > > Steve -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html