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Full Discussion: awk - function to return permutations of n items out of m
Top Forums Shell Programming and Scripting awk - function to return permutations of n items out of m Post 303028487 by cjnwl on Wednesday 9th of January 2019 11:15:45 AM
Old 01-09-2019
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 :
Code:
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 lines = 5 ^^ 3).

I've managed to write a function with nested loops that works, but only for a predetermined depth. I can't seem to manage the recursion if I want n to be variable.

Also, an added difficulty is that I need the results in an array for further processing in the same script, not just output to the console.

Any help would be much appreciated.
Chris
 

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LEARN ABOUT DEBIAN

item_count

items(3MENU)															      items(3MENU)

NAME

       menu_items - make and break connections between items and menus

SYNOPSIS

       #include <menu.h>
       int set_menu_items(MENU *menu, ITEM **items);
       ITEM **menu_items(const MENU *menu);
       int item_count(const MENU *menu);

DESCRIPTION

       The function set_menu_items changes the item pointer array of the given menu.  The array must be terminated by a NULL.

       The function menu_items returns the item array of the given menu.

       The function item_count returns the count of items in menu.

RETURN VALUES

       The function menu_items returns a pointer (which may be NULL).  It does not set errno.

       The function item_count returns ERR (the general curses error return value) if its menu parameter is NULL.

       The function set_menu_items returns one of the following codes on error:

       E_OK The routine succeeded.

       E_BAD_ARGUMENT
	    Routine detected an incorrect or out-of-range argument.

       E_NOT_CONNECTED
	    No items are connected to the menu.

       E_POSTED
	    The menu is already posted.

       E_SYSTEM_ERROR
	    System error occurred (see errno).

SEE ALSO

       ncurses(3NCURSES), menu(3MENU).

NOTES

       The header file <menu.h> automatically includes the header file <curses.h>.

PORTABILITY

       These routines emulate the System V menu library.  They were not supported on Version 7 or BSD versions.

       The SVr4 menu library documentation specifies the item_count error value as -1 (which is the value of ERR).

AUTHORS

       Juergen Pfeifer.  Manual pages and adaptation for new curses by Eric S. Raymond.

																      items(3MENU)
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