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

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

Thank you again, Ethan, for the explanations and links.

What's still not clear to me why you can place the
ysum=0 between two plot commands...
What else can you place in front of a plot command?
For example:
n=1
plot n=n+1 sin(x*n) # works
plot (n=1,n=n+1) sin(x*n) # doesn't work... why?


Anyway, my original question is solved :-).
Nevertheless, I played around a little further.
If the portions in the stacked histogram are too small to fit a number,
the following code shows a way to place those numbers on the side with a
pointing arrow.
Maybe some people also mind find this useful.

The following code was working on my system (Win7, gnuplot 5.2) and
should be ready for copy&paste&plot. Be aware that the mail program
might have "messed up" the line breaks.

###### start gnuplot code
reset
$Data <<EOD
XXX Header1 Header2
one 10 50
two 3 2
three 30 15
four 40 5
five 0.5 0.5
six 0.6 0.6
seven 1 17
EOD

set style data histogram
set style histogram columnstacked
set style fill solid border -1
set boxwidth 0.6

YminSpace = 4
YStep = 2
YExtraDistance = -YStep
XShift(n) = (n < YminSpace) ? 0.45 : 0
YShift(n) = (n < YminSpace) ?
(YExtraDistance=YExtraDistance+YStep,YExtraDistance) :
(YExtraDistance=-YStep,0)

plot \
  $Data u 2 ti col , '' u 3:key(1) ti col, \
  ysum=0 '' skip 1 using (0+XShift($2)):((ysum = ysum + $2,
ysum-$2/2+YShift($2))):2 with labels notitle, \
  ysum=0 '' skip 1 using (1+XShift($3)):((ysum = ysum + $3,
ysum-$3/2+YShift($3))):3 with labels notitle,\
  ysum=0 '' skip 1 using ($2>YminSpace ? 1/0:(0+XShift($2)-0.05)):((ysum
= ysum + $2, ysum-$2/2+YShift($2))):(-0.1):(-YExtraDistance) ls -1 with
vectors not,\
  ysum=0 '' skip 1 using ($3>YminSpace ? 1/0:(1+XShift($3)-0.05)):((ysum
= ysum + $3, ysum-$3/2+YShift($3))):(-0.1):(-YExtraDistance) ls -1 with
vectors not,\

###### end gnuplot code