gnuplot conditional plotting with if column value is greater than 2.5

[dieudonne ngaya]

Hi all,

I have a data file with two columns like this:
date avelp1219p01 avelp1219p02 avelp1219p03 avelp1219p04
2017.11.12 1.9294 2.4847 1.7317 2.0424
2017.11.13 1.9451 2.49669 1.7477 1.99816
2017.11.14 1.9451 2.49669 1.7477 1.99816
2017.11.15 1.9451 2.49669 1.7477 1.99816
2017.11.16 1.9451 2.49669 1.7477 1.99816
2017.11.17 1.9451 2.49669 1.7477 1.99816

I want to plot the colums value for avelp1219p01, avelp1219p02, avelp1219p03, avelp1219p04 if column value is greater than or equal 2.5.

Without this condition, my histogram works very well but i want to add this condition.
here my gnuplot without this condition:

# set terminal pngcairo  transparent enhanced font "arial,10" fontscale 1.0 size 600, 400
# set output 'histograms.7.png'
#set term postscript landscape enhanced color dashed "Helvetica" 14
set term postscript landscape enhanced color dashed "Helvetica" 10
set output "datagrowthbynode.ps"
set border 3 front lt black linewidth 1.000 dashtype solid
set boxwidth 0.95 absolute
set style fill   solid 1.00 noborder
set grid nopolar
set grid noxtics nomxtics ytics nomytics noztics nomztics nortics nomrtics \
 nox2tics nomx2tics noy2tics nomy2tics nocbtics nomcbtics
set grid layerdefault   lt 0 linecolor 0 linewidth 0.500,  lt 0 linecolor 0 linewidth 0.500
set key bmargin center horizontal Left reverse noenhanced autotitle columnhead nobox
set style histogram clustered gap 5 title textcolor lt -1 offset character 4, 0.25
#set style histogram clustered gap 1 title textcolor lt -1 offset character 2, 0.25


set auto x

set datafile missing '-'
set style data histograms
set xtics border in scale 0,0 nomirror rotate by -45  autojustify
set xtics  norangelimit  font ",8"
set xtics   ()
set ytics border in scale 0,0 mirror norotate  autojustify
set ytics  norangelimit autofreq  font ",8"
set ztics border in scale 0,0 nomirror norotate  autojustify
set cbtics border in scale 0,0 mirror norotate  autojustify
set rtics axis in scale 0,0 nomirror norotate  autojustify
set title "Total Disk Used Trends by Nodes in GH2\n"
set xlabel " "
set xlabel  offset character 0, -2, 0 font "" textcolor lt -1 norotate
set ylabel "Disk used in TB"
DEBUG_TERM_HTIC = 119
DEBUG_TERM_VTIC = 119
## Last datafile plotted: "$FILE"
plot newhistogram "Nodes in GH2", '$FILE' using "avelp1219p01":xtic(1)  t col lc rgb "#800000", '' u "avelp1219p02" t col lc rgb "#000000",'' u "avelp1219p03" t col lc rgb "#a0a0a0", '' u "avelp1219p04" t col lc rgb "#ff0000",'' u "avelp1219p05" t col lc rgb "#00c000", '' u "avelp1219p12" t col lc rgb "#0080ff",'' u "avelp1219p13" t col lc rgb "#c000ff", '' u "avelp1219p14" t col lc rgb "#00eeee",'' u "avelp1219p15" t col lc rgb "#c04000", '' u "avelp1219p16" t col lc rgb "#c8c800",'' u "avelp1219p17" t col lc rgb "#4169e1", '' u "avelp1219p18" t col lc rgb "#ffc020",'' u "avelp1219p19" t col lc rgb "#008040", '' u "avelp1219p20" t col lc "#c080ff",'' u "avelp1219p21" t col lc rgb "#306080", '' u "avelp1219p22" t col lc rgb "#8b0000", '' u "avelp1219p23" t col lc rgb "#408000", '' u "avelp1219p24" t col  lc "#ff80ff",'' u "avelp1219p25" t col lc rgb "#7fffd4", '' u "avelp1219p26" t col lc rgb "#a52a2a",'' u "avelp1219p27" t col lc rgb "#ffff00", '' u "avelp1219p28" t col lc rgb "#40e0d0", '' u "avelp1219p29" t col lc rgb "#1a1a1a", '' u "avelp1219p30" t col lc rgb "#f03232",'' u "avelp1219p31" t col lc rgb "#ffd700",'' u "avelp1219p32" t col  lc rgb "#00ff00",'' u "avelp1219p33" t col lc rgb "#0000ff", '' u "avelp1219p34" t col lc rgb "#000080",'' u "avelp1219p35" t col lc rgb "#00ffff", '' u "avelp1219p36" t col lc rgb "#ff00ff",'' u "avelp1219p37" t col lc rgb "#f0e68c", '' u "avelp1219p38" t col lc rgb "#a08020",'' u "avelp1219p39" t col lc rgb "#ffa500", '' u "avelp1219p40" t col lc rgb  "#ee82ee", '' u "avelp1219p41" t col lc rgb  "#dda0dd", '' u "avelp1219p42" t col  lc rgb "#801414",'' u "avelp1219p43" t col lc rgb "#804014", '' u "avelp1219p44" t col lc rgb "#804080", '' u "avelp1219p45" t col lc rgb "#8060ff", '' u "avelp1219p46" t col lc rgb "#ffc0c0"

someone can help me to add condition which allow me to display only if the column value is greater than 2.5 ?

I read document but i did not find solution .

Thank you for your help.

Best regards.