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Searching partial columns and returning maximum as output

 
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Old 07-29-2008
Searching partial columns and returning maximum as output
Hello,

I am just getting starting with awk and wondering if anyone could help with the following problem.

I have a large file of data, 50,000 rows x 6 columns. I would like to search in blocks of 500 rows for a maximum value in a specific column and compile an output file that prints the complete line for each maximum per 500.

Example, using a 10row x 3column, requested output for blocks of 5 rows:

1 L 3.2
2 F 6.5
3 J 8.4
4 E 5.1
5 A 4.2
6 U 2.2
7 O 6.9
8 H 4.5
9 D 2.3
10 R 21.3

Required Output:

3 J 8.4
10 R 21.3

Any help would be most appreciated,

Rob
 
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LEARN ABOUT SUNOS

menu_format

menu_format(3CURSES)					     Curses Library Functions					      menu_format(3CURSES)

NAME

       menu_format, set_menu_format - set and get maximum numbers of rows and columns in menus

SYNOPSIS

       cc [ flag... ] file... -lmenu -lcurses [ library... ]
       #include <menu.h>

       int set_menu_format(MENU *menu, int rows, int cols);

       void menu_format(MENU *menu, int *rows, int *cols);

DESCRIPTION

       set_menu_format()  sets	the  maximum number of rows and columns of items that may be displayed at one time on a menu. If the menu contains
       more items than can be displayed at once, the menu will be scrollable.

       menu_format() returns the maximum number of rows and columns that may be displayed at one time on menu. rows and cols are pointers  to  the
       variables used to return these values.

RETURN VALUES

       set_menu_format() returns one of the following:

       E_OK		       The routine returned successfully.

       E_SYSTEM_ERROR	       System error.

       E_BAD_ARGUMENT	       An incorrect argument was passed to the routine.

       E_POSTED 	       The menu is already posted.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Unsafe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       curses(3CURSES), menus(3CURSES), attributes(5)

NOTES

       The header <menu.h> automatically includes the headers  <eti.h> and <curses.h>.

SunOS 5.10							    31 Dec 1996 					      menu_format(3CURSES)