Re: [Gnuplot-info] How to place values on a columnstacked histogram?

[theozh <th...@gm...>]

Thanks a lot Ethan,
I'll never would have found this one.
With the minor change "ysum-$2/2", the following seems to place the
number in the center of the portion.

plot $Data u 2 ti col , '' u 3:key(1) ti col, \
     ysum=0 '' skip 1 using (0):((ysum = ysum + $2, ysum-$2/2)):2 with
labels notitle, \
     ysum=0 '' skip 1 using (1):((ysum = ysum + $3, ysum-$3/2)):3 with
labels notitle

However, if looking at the syntax in "help plot"
plot-element:
           {<iteration>}
           <definition> | {sampling-range} <function> | <data source>
           {axes <axes>} {<title-spec>}
           {with <style>}

I still don't understand why and how ((ysum = ysum + $2, ysum-$2/2))
works. So apparently, you can place an expression/function before the
comma and the expression after the comma is actually plotted? Good to
know, I didn't know that one can make such constructs. Would be nice to
have an example in "plot help" or if you have a link where to find this
documented, please let me know.