Question

Use BASH to make a code that takes any list of numbers and calculate the Median and Mode.

Answer 1

# Total numbers 
n=7 
   
# copying the value of n 
m=$n 
   
# initialized sum by 0 
sum=0 
   
# array initialized with 
# some numbers 
array=(3 4 1 8 9 10 2) 
#sorted array for median
sortedarray=( $( printf "%s\n" "${array[@]}" | sort -n ) )
   
# loop until n is greater 
# than 0 
while [ $n -gt 0 ] 
do
    # copy element in a  
    # temp variable 
    num=${sortedarray[`expr $n - 1`]}     
   
    # add them to sum 
    sum=`expr $sum + $num`
   
    # decrement count of n 
    n=`expr $n - 1`
done 
   
# displaying the average  
# bc is bash calculator 
avg=`echo "$sum / $m" | bc -l`
#k storing the modulus
k=$(( $m % 2 )) 
if [ $k -eq 0 ] #if m is odd then median will be the middle index value of the sorted array
then
    i=$(( $m / 2 )) #index
    p1=$(( $i)) #first index
    p2=$(( $i - 1)) #second index
    s=$(( ${sortedarray[$p1]}+ ${sortedarray[$p2]} )) #sum of this 2
    med=$(( s/2 )) #median
    
else #if even then median will be sum of middle 2 values divided by 2 of the sorted array
   i=$(( $m / 2 )) #index
   med=${sortedarray[$i]} #median
fi

echo "The array is : ${array[@]}"

printf 'Average %0.3f \n' "$avg"

printf 'Median %0.3f' "$med"

Tried with n=8