statistics: added a script that outputs the min, max and average tree sizes of a given input file

#!/bin/bash

# file: nodes_per_tree.sh

#

# usage: ./prepare_data.sh <inputfile>

#

# Program: Counts the number of nodes per line. Ouputs the maximal, 

#          minimal and average number of nodes per line of the given 

#          inputfile containing a tree in bracket notation per line.

#

# Author: Thomas Huetter

if [ -z "$1" ]

  then

    echo "Argument missing."

    echo "Usage: ./prepare_data.sh <inputfile>"

    exit 1

fi

awk -F '\{' '{print NF-1}' $1 | awk 'NR == 1 { max=$1; min=$1; sum=0 }

   { if ($1>max) max=$1; if ($1<min) min=$1; sum+=$1;}

   END {printf "Min: %d\tMax: %d\tAverage: %f\n", min, max, sum/NR}'