Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

Combinations / Permutations

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Combinations / Permutations
# 1  
Old 02-15-2011
Question Combinations / Permutations
Hello Scrutinizer / Group ,

The shell script of awk that Scrutinizer made calculate all possible permutations in this case 3125 (5 numbers) but i want to have only the 126 possible combination. For now it does not matter the specific order of the combination numbers.

I would appreciate it you can help me with the awk script of combination.


Regards,
Carlos S

infile
Code:
1
2
3
4
5

Output, example
Code:
1+2+3+4+5
1+1+3+4+5
2+2+3+4+5
1+2+3+4+4
....
....
....

----------------------------------------------------------------
Code:
awk 'function perm(p,s,     i) {
       for(i=1;i<=n;i++)
         if(p==1)
           printf "%s%s=\n\n",s,A[i]
         else
           perm(p-1,s A[i]" + ")
     }
     {
       A[++n]=$1
     }
     END{
       perm(n)
     }' infile

Last edited by Franklin52; 02-16-2011 at 08:18 AM.. Reason: Please use code tags
# 2  
Old 02-16-2011
Permutations:

Code:
awk '
function perm(l,v,i) {
    for(i in A) {
      if(l < length(A))
         perm(l+1, (v?v"+":x)i);
      else print v"+"i;
    }
}
{ A[$0] }
END {
   perm(1);
} ' infile

Combinations. Note: there are only 120 for 5 items (ie 5! = 120):
Code:
awk '
function comb(v,i) {
    for(i in A) {
      delete A[i];
      if(length(A))
         comb((v?v"+":x)i)
      else print v"+"i
      A[i];
    }
}
{ A[$0] }
END {
   comb();
} ' infile

Last edited by Chubler_XL; 02-16-2011 at 01:31 AM.. Reason: Fixed parameters and added note on # of combinations
This User Gave Thanks to Chubler_XL For This Post:
csierra
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

awk - function to return permutations of n items out of m

Hi, I'm trying to write an awk function that returns all possible permutations of n items chosen in a list of m items. For example, given the input "a,b,c,d,e" and 3, the function should return the following : a a a a a b a a c a b a a b b ... c a a c a b ... e e c e e d e e e (125... (21 Replies)
Discussion started by: cjnwl
21 Replies

2. Shell Programming and Scripting

awk permutations and combinations

hello, I'm reading this thread, in which there is this code :awk ' function comb(v,i) { for(i in A) { delete A; if(length(A)) comb((v?v"+":x)i) else print v"+"i A; } } { A } END { comb(); } ' infilebut I can't understand where does v come... (5 Replies)
Discussion started by: daPeach
5 Replies

3. Shell Programming and Scripting

All possible combinations problem

Post #2 is the original post. This is the first answer to post #2 Hi, try: awk ' { match($0,/1+/) b=substr($0,1,RSTART-1) e=substr($0,RSTART+RLENGTH,length) for(i=2^RLENGTH-2; i>0; i--) { s=x; d=i while(d) { s=(d%2==0?0:1) s ... (12 Replies)
Discussion started by: Scrutinizer
12 Replies

4. Shell Programming and Scripting

Permutations with awk

Hello I have a very simple input file in which there are a list of numbers: 1 2 3 4 5 6 7 8 9 10 My actual dataset is about 200 lines long. I was wondering how to add different permutations of 3 numbers for all the numbers in the dataset. For example: 1+2+3; 3+5+7; 2+8+1; 9+3+4... (1 Reply)
Discussion started by: Rabu
1 Replies

5. UNIX for Dummies Questions & Answers

All combinations from simple regex

Hi ! Before trying to write a code, is there any program or code that generates all the combinations of strings that simple awk regex can match. By "simple regex" I mean let's say without "+", "*", and with a limited number of characters (e.g. from "1" to "5"). e.g: input: 34?5 output:... (9 Replies)
Discussion started by: beca123456
9 Replies

6. Shell Programming and Scripting

All possible combinations

Hi, I have an input file like this a b c d I want to print all possible combinations between these records in the following way aVSb aVSc aVSd bVSc bVSd cVSd VS indicates versus. All thoughts are appreciated. (5 Replies)
Discussion started by: jacobs.smith
5 Replies

7. Linux

Help with color combinations

Hi Team when i do, echo on my host box it returns (see below) # echo $PS1 \$ I need to set a color comination of my own for \u means for user : red for \h means for hostname: blue for \W means present working directory: pink for $ means for wht prompt : yellow Do i need to... (1 Reply)
Discussion started by: whizkidash
1 Replies

8. Programming

series of combinations

HI I have a series(sorted), which i require to create combinations. I am not getting the good code for doing this. My series should generate the following combinations... Please help me in getting this in C++. Thanks for your help. A: A A B: A B A B A B C: A ... (1 Reply)
Discussion started by: rameshmelam
1 Replies

9. Shell Programming and Scripting

Generating Combinations

Hi, I need to generate all combinations upto n-1 level, if the input file looks like say, A B C D . . .... I need to generate all combinations such that first value remains constant and the remaning are combined with all possible ways. Output A AB AC AD ABC (1 Reply)
Discussion started by: zorg4u
1 Replies

10. UNIX for Advanced & Expert Users

Combinations

Hello All, i have two files, one of the format A 123 B 124 C 234 D 345 And the other A 678 B 789 C 689 D 567 I would like to combine them into one file with three columns: A 123 678 B 124 789 C 234 689 (4 Replies)
Discussion started by: Khoomfire
4 Replies
Login or Register to Ask a Question