[Gnuplot-info] Projection of 2D color graph on X axis

[1sezgin <1se...@gm...>]

I have a problem with gnuplot. ( Version 4.2 patchlevel 2)
With the code which I past belove I produce a 2D color image. I would
like to make projection on x axis which mean by using a data like;
x    y    z
1    1    2
1    2    0
1    3    1
1    4    1
2    1    1
2    2    0
2    3    1
2    4    0
3    1    2
3    2    0
3    3    1
3    4    2

as a result of projection I want to draw these new lines  (it should
sum z values for every y group (from 1 to 4)

x   new y
1      4
2      2
3      5

is it possible to make this with gnuplot?

My goal is to draw one divided graph, which has a color graph up
(first  data) and projection of first data (second data) like a
histogram, down.
Sezgin

set xlabel 'A1'
set ylabel 'B1'
set view map
#set palette rgbformulae 10,13,33
set palette gray
set cbrange [0:5]
set xrange [0:3276]
set yrange [-1638:1638]
set term png size 840,840
set output 'image.png'

splot 'ASCIIdata.txt' using (0.7*($1+$2)):(0.7*($1-$2)):3 notitle with
points palette ps 1 pt 5

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