Each x-th element an x-label and boxes with labels

[SteppXXL <mm4...@sp...>]

Hello there

I got following


set data style boxes

set boxwidth 0.9
set style fill solid 1.0

set xrange [-1:]
set yrange [0:]

set xtics ("5" 0*6, "10" 1*6, "15" 2*6)

plot 	"data" using ($0):($3) linetype 1, \
	"" using ($0):($5>=0 ? $3 : 0) linetype 2

pause -1 "Hit return to continue"


with data

5	1	32	914	2 classe(s), 1 transition(s)
5	2	16	922	2 classe(s), 1 transition(s)
5	3	8	1544	137 classe(s), 39 transition(s)
5	4	8	888	1 classe(s), 0 transition(s)
5	5	16	903	1 classe(s), 0 transition(s)
5	6	16	1139	
10	1	32	1011	2 classe(s), 1 transition(s)
10	2	16	1003	1 classe(s), 0 transition(s)
10	3	32	1080	4 classe(s), 4 transition(s)
10	4	64	1047	4 classe(s), 3 transition(s)
10	5	128	1022	
10	6	128	1011	1 classe(s), 0 transition(s)
15	1	256	1182	3 classe(s), 3 transition(s)
15	2	128	1393	10 classe(s), 19 transition(s)
15	3	256	1131	
15	4	128	1336	8 classe(s), 16 transition(s)
15	5	64	1084	2 classe(s), 1 transition(s)
15	6	32	1144	3 classe(s), 2 transition(s)


Now I urgently need to label the x-axis as written above but dynamical:
At each 6-th element I need a label at x-axis namely the first column. So
how to say something like


plot 	"data" using ($0):($3):xtic(if $2==1 : $1 else "") linetype 1

Everytime the second column has the value 1 the x-axis shall get the value
from corresponding value in column $1.

My little example 'set xtics ("5" 0*6, "10" 1*6, "15" 2*6)' is possible
because I view just a little range. The real datums will go until 10,000 !
If it's possible by a for-loop just tell me. I did not find something.


My 2nd question: How to get the boxes labelled? For example each box shall
contain the number of 4th column (in or over it).

Regards
Stepp

//edit
I'm wondering:

	"" using ($0):($2==1 ? 10 : 0):xtic($2==1 ? "1" : "")

This works but I don't need the string "1" but column 1 or $1.
But
	"" using ($0):($2==1 ? 10 : 0):xtic($2==1 ? 1 : "")
or
	"" using ($0):($2==1 ? 10 : 0):xtic($2==1 ? $1 : "")
=> 
Tic label does not evaluate as string!

And most strange

	"" using ($0):($2==1 ? 10 : 0):xtic(2==1 ? 1 : 2)

compares whether col 2 equal col 1, if yes so label with col 1 else label
with col 2.
Without any '$'s it only deals with columns. 
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