matriz/helper_scripts/generate

#!/bin/bash
function generate(){
  # NAME
  #   generate - generate a matrix of a specified size
  # SYNOPSIS
  #   generate ROWS COLS RANGE
  # DESCRIPTION
  #   Outputs a matrix with ROWS and COLS as dimensions. If RANGE is an integer, the entries
  #   of the matrix will be random integers in (-RANGE,+RANGE). If RANGE is a string starting
  #   with 'Z' or 'z', the matrix will be populated with zeroes. If RANGE is a string starting
  #   with 'O' or 'o', the matrix will be populated with ones. If RANGE is a string starting
  #   with 'D' or 'd', the matrix will be a diagonal matrix with ones along the diagonal entries.
  # AUTHOR
  #   Written by Ryan Gambord (gambordr@oregonstate.edu)

  [ $# -ne 3 ] && echo "invalid number of arguments" >&2      # This is equivalent to using an if statement.
                                                              # The right side of the && operator will not
                                                              # be evaluated unless the left side is true.
  for arg in $1 $2
  do
    [[ $arg =~ [^0-9]+ ]] && echo "argument '$arg' is not an integer" >&2
  done

  y=0
  while [ $y -lt $1 ]
  do
    x=0
    ((y++))
    while [ $x -lt $2 ]
    do
      ((x++))
      case $3 in
        [oO]*) echo -n 1;;
        [zZ]*) echo -n 0;;
        [dD]*) [ $x -eq $y ] && echo -n 1 || echo -n 0;;
        *) if [[ "$3" =~ [^0-9]+ ]]
             then
               echo "invalid RANGE" >&2
               exit 1
             else
               echo -n $(( (RANDOM - 32767 / 2) % $3 ))
             fi;;
      esac
      if [ $x -ne $2 ]
      then
        echo -ne "\t"
      else
        echo
      fi
    done
  done
}
generate $1 $2 $3