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How to find sum of any 'n' number of values from file matching target value?


 
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Top Forums Shell Programming and Scripting How to find sum of any 'n' number of values from file matching target value?
# 1  
Old 08-15-2013
Code How to find sum of any 'n' number of values from file matching target value?

I have a simple text file having payment amount value on each line. At the end of day 'n' number of payments created difference in amount that I need to match from this file.

I have information about how many payments created difference and difference amount. Please help me to build shell script to find these any combination of 'n' records matching target value.

For example file is:
Code:
1.0
25.5
75.5
8.10
100.25
145.67
88.12

and I want to find sum of any 3 values matching target value of 201.25
so expected result is
Code:
25.5
75.6
100.25

thanks in advance.
Smilie

Last edited by Franklin52; 08-16-2013 at 03:20 AM.. Reason: Please use code tags
# 2  
Old 08-15-2013
This is a np-complete problem and any solution will quickly take a huge amount of time to solve as the number of values in your file increases.

Do you want to print every solution or only the first found?
# 3  
Old 08-15-2013
try:
Code:
awk '
{a[NR]=b[NR]=c[NR]=$1}
END {
   f=0;
   for (i=1; i<=NR; i++) {
      for (j=1; j<=NR; j++) {
         for (k=1; k<=NR; k++) {
            if (a[i]+ b[j] + c[k] == tv && (i!=j && i!=k && j!=k)) {
               print a[i];
               print b[j];
               print c[k];
               exit;
            }
         }
      }
   }
   print "No values found.";
}' tv=201.25 infile

# 4  
Old 08-15-2013
How about:

Code:
sort -n infile | awk -vn=4 -vt=209.35 '
function check(vals, s, need, depth)
{
    for (;s<=X; s++) {
       if(depth && F[s]<need) check(vals ORS F[s], s+1, need-F[s], depth-1)
       if(!depth&&F[s]==need) printf vals ORS F[s] ORS
       if(F[s]>=need) return
    }
}
{F[++X]=$0}
END { check("", 1, t, n-1) }'

8.10
25.5
75.5
100.25


Last edited by Chubler_XL; 08-15-2013 at 08:25 PM..

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