Convert MCS to random approximate (X,Y) coordination

mcs2xy.sh

#!/bin/bash

. math.sh

if ! [ $# -eq 1 ]; then
 echo "./mcs2xy.sh <mcs index>"
 exit
fi

platform='unknown'
unamestr=`uname`
if [[ "$unamestr" == 'Linux' ]]; then
   platform='linux'
elif [[ "$unamestr" == 'FreeBSD' ]]; then
   platform='freebsd'
elif [[ "$unamestr" == 'Darwin' ]]; then
   platform='osx'
fi


## Table
## | MCS | Range(m) |
## |  0  | < 1200   |
## |  1  | < 800    |
## |  2  | < 600    |
## |  3  | < 400    |
## |  4  | < 300    |
## |  5  | < 170    |
## |  6  | < 150    |
## |  7  | < 100    |
## |  8  | < 50     |

#declare -a Range=('1200' '800' '600' '400' '300' '170' '150' '100' '50')

declare -a Range=('100' '80' '70' '60' '50' '40' '30' '20' '10')

mcs=$1

if [[ "$platform" == "osx" ]]; then
 if [ $mcs -eq 8 ]; then
  r=`jot -r 1 1 ${Range[$mcs]}` 
 else
  r=`jot -r 1  ${Range[$(($mcs+1))]} ${Range[$mcs]}`
 fi
 theta=`jot -r 1  0 360`
else
 if [[ "$mcs" -eq 8 ]]; then
  r=`shuf -i 1-${Range[$mcs]} -n 1`
 else
  r=`shuf -n 1 -i ${Range[$(($mcs+1))]}-${Range[$mcs]}`
 fi
 theta=`shuf -n 1  -i 0-360` 
fi

#echo $r $theta
s=`sin $theta`
c=`cos $theta`
x=`echo "$r*$c"|bc`
y=`echo "$r*$s"|bc`
echo "$x $y"