Rnuplot

Use gnuplot to directly plot ROOT data, no intermediate steps

Usage

1. Write gnuplot plotting scripts like normal
2. Add a comment line in your script like this

# root2gnuplot input.root:histogram_name output.dat "x y xlow xhigh ylow yhigh"

this line instructs rnuplot how to convert your ROOT data. It uses an internal version of the root2gnuplot tool. See details here. You can control the format of the conversion for custom plotting types in gnuplot. You can also plot 'directly' from ROOT TTrees.

3. Run your script with rnuplot instead of gnuplot and it will just work

Full usage details

Usage:
  rnuplot [OPTION...] [FILE]

  -c, --cache             Use cached data, set to true to use cached data
  -f, --file arg          File
  -d, --debug arg         Enable debugging
  -r, --root2gnuplot arg  Convert ROOT data using root2gnuplot (useful if
                          not specified in gnuplot script comment
  -h, --help              Print usage

Example

set terminal pngcairo font "Helvetica, 18" size 1200,900 
set output 'demo.png'

set xlabel "𝛂" 
set ylabel "Counts"

set bars small #removes caps from error bars

# root2gnuplot input.root:histo_name h1.dat "x y xlow xhigh ylow yhigh"
plot 'h1.dat' u 1:2:3:4:($5):($6) with xyerr ls 2 pt 15 ps 0 lw 2 t 'ROOT histogram'

OR without modifying your gnuplot script at all you can:

rnuplot -r 'input.root:histo_name h1.dat "x y xlow xhigh ylow yhigh"' script.gnuplot

with a script like this:

set terminal pngcairo font "Helvetica, 18" size 1200,900 
set output 'h1.png'

set xlabel "x" 
set ylabel "y"

set bars small #removes caps from error bars
set style fill   solid 1.00 border

plot 'h1.dat' u ($1+($3-$4)/2.0):2  with fillsteps fc rgb "#aa00ff" t "h1", 'h1.dat' u 1:2:3:4:($5):($6) with xyerr ls 2 pt 15 ps 0 lw 2 lc rgb "#000000" notitle

Notice that these are valid gnuplot scripts. In fact, once the conversion step is done (first time) you can run future plots with gnuplot directly. Only comments with the root2gnuplot word are parsed for conversions

Build Steps

1. clone the repo
2. build: make

Install

just put rnuplot somewhere on the PATH.
Then you are ready to use rnuplot, also make sure gnuplot is on the PATH

Requirements

• c++14
• ROOT (tested with v6-24-00@v6-24-00)
• gnuplot (tested with v5.4) on the PATH

Uses

• cxxopts as internal dependency