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Full Discussion: Awk search for max and min field values
Top Forums UNIX for Dummies Questions & Answers Awk search for max and min field values Post 302219381 by era on Tuesday 29th of July 2008 01:11:46 AM
Old 07-29-2008
What's the range of possible values? Can you just initialize min to some ridiculously large value?

Code:
BEGIN { FS=","; max=0; min=9876543210; }
NF == 7 { if (max < $6) max=$6; if (min > $6) min=$6; }
END { print min, max }

Some variants of awk might have a problem with an integer of that size; if you get an error message, try with different values.

Another approach might be to initialize it to an empty string, and make a more complex condition to cover that case. Yet another approach might be to have a sentinel variable which is set to 0 initially and then to 1 when max and min are first defined:

Code:
BEGIN { FS=","; defined=0; }
NF==7 { if (! defined) { max = min = $6; defined = 1; next;
    if (max < $6) max=$6; if (min > $6) min=$6; }
END { print min, max }

 

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LEARN ABOUT DEBIAN

gedcom::grammar

Gedcom::Grammar(3pm)					User Contributed Perl Documentation				      Gedcom::Grammar(3pm)

NAME

       Gedcom::Grammar - a module to manipulate Gedcom grammars

       Version 1.16 - 24th April 2009

SYNOPSIS

	 use Gedcom::Grammar;

	 my $st = $grammar->structure("GEDCOM");
	 my @sgr = $grammar->item("DATE");
	 my @items = $grammar->valid_items;
	 my $min = $grammar->min;
	 my $max = $grammar->max;
	 my @items = $grammar->items;

DESCRIPTION

       A selection of subroutines to handle the grammar of a gedcom file.

       Derived from Gedcom::Item.

HASH MEMBERS

       Some of the more important hash members are:

   $grammar->{top}
       The top of the grammar tree.

   $grammar->{top}{structures}
       A reference to a hash mapping the names of all structures to the grammar objects.

METHODS

   structures
	 my $st = $grammar->structure("GEDCOM");

       Return the grammar item of the specified structure, if it exists, or undef.

   item
	 my @sgr = $grammar->item("DATE");

       Return a list of the possible grammar items of the specified sub-item, if it exists.

   min
	 my $min = $grammar->min;

       Return the minimum permissible number of $grammar items

   max
	 my $max = $grammar->max;

       Return the maximum permissible number of $grammar items

   items
	 my @items = $grammar->items;

       Return a list of tags of the grammar's sub-items

   valid_items
	 my @items = $grammar->valid_items;

       Return a hash detailing all the valid sub-items of the grammar item.  The key is the tag of the sub-item and the value is an array of
       hashes with three members:

	 grammar => the sub-item grammar
	 min	 => the minimum permissible number of these sub-items
	 max	 => the maximum permissible number of these sub-items

perl v5.14.2							    2012-04-12						      Gedcom::Grammar(3pm)
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