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Full Discussion: Arithmetic operation between columns using loop variable
Top Forums Shell Programming and Scripting Arithmetic operation between columns using loop variable Post 302485418 by michaelrozar17 on Wednesday 5th of January 2011 07:32:12 AM
Old 01-05-2011
Quote:
Originally Posted by Surabhi_so_mh
I am doing like this:
Code:
for ((i=1; i<=3; i++))
do
  a=`echo "2*$i+2.561" | bc -l`   
  awk '{ printf"%.8f %.8f %.8f\n", ($1/a), $2, $3 }' infile >> out$i
done

but it seems variable a has to be defined within awk. how can I use i in it? Please help
To declare a variable within awk use -v option..so the above awk could be as
Code:
awk -v var="$a" '{ printf"%.8f %.8f %.8f\n", $1/var, $2, $3 }' infile >> out$i

 

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