hi monks,

i'm working on a problem involving using the gps data to figure out the direction of each link (i.e. northwest, south east...). i wrote a code as below, but it keeps giving me error, about "global symbol $A requires explicit package name...." anyone can help ? 

#!/usr/bin/perl
use strict;
use warnings;
# 1)input file
my $file = "c:/documents and settings/desktop/dirTable.csv";
open (TEMP, $file) or die("Error: cannot open $file\n");

# 2)output file
my $outfile = "c:/documents and settings/desktop/dirMatched.csv";
open (OUTPUT,">$outfile") or die("Error: cannot open $outfile\n");

#Private variables
my $nline = "\n";
my $comma = ",";
my @direction = ["east","west","north","south"];

#Main body

while (my $line = <TEMP>)
{   
    my @column = split (/,/,$line);
    if ($column[4] < $column[7])
       { my $A = $direction[0];
       }else {$A = $direction[1]; }
    if ($column[5] < $column[8])
       { my $B = $direction[2];
       }else {$B = $direction[3]; }
    $dir = $A.$B;
    
     print OUTPUT $column[4],$comma,$column[5],$comma,$column[7],$comm
+a,$column[8],$comma,$A,$comma,$B,$comma,$nline;
 }

[download]

$column4,7 are the x coordinates. $column5,7 are the y coordinates.

thanks a lot,

In reply to Use perl to do direction matching by hujunsimon

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