CODEWITHSUNDEEP
gnuplotscaling
Rasheed Aadeez
Rasheed Aadeez

Reputation: 31

Scaling the data in gnuplot

I want to scale my "y" data with some function in Gnuplot.

My data file "LB.dat"

 #x            #y
0.393000E+01 0.777894E+01
0.394000E+01 0.878703E+01
0.395000E+01 0.995059E+01
0.396000E+01 0.113780E+02
0.397000E+01 0.132372E+02
0.398000E+01 0.158209E+02
0.399000E+01 0.197064E+02
0.400000E+01 0.261749E+02
0.401000E+01 0.378215E+02
0.402000E+01 0.413921E+02
0.403000E+01 0.187385E+01
0.404000E+01 0.479743E+01
0.405000E+01 0.209362E+02
0.406000E+01 0.615307E+02
0.407000E+01 0.192419E+03
0.408000E+01 0.822545E+02
0.409000E+01 0.147813E+02
0.410000E+01 0.253664E+01
0.411000E+01 0.964172E-01
0.412000E+01 0.443564E+00

I want to scale my "y" data using the function exp(-a*"y") where 'a' is some constant.

Here is my script file.

set terminal postscript eps enhanced "Helvetica" 18 color
set output "scaling.eps"
set size 1,1
set xlabel "x" font "Helvetica,22"
set xrange[0:100]
set logscale y
set format y "10^{%L}"
set ylabel "y" font "Helvetica,22"

plot "LB.dat" using 1:exp(-0.5*$2) w l lw 1.5 lc 'blue' title "scaledLB"

When I run it I am getting an error message " plot "LB.dat" using 1:exp(-0.5*$2) w l lw 1.5 lc 'blue' title "scaledLB"

                               ^
     "scale.gp", line 13: undefined value "

Please help me resolve this issue.

Upvotes: 1

Views: 515

Answers (1)

theozh
theozh

Reputation: 26198

if you are using a formula with columns put the whole expression into (), i.e. (exp(-0.5*$2))

plot "LB.dat" using 1:(exp(-0.5*$2)) w l lw 1.5 lc 'blue' title "scaledLB"

Upvotes: 2

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