Ok let me ask the question again, I dont think I was clear enough in explaining what I need :( I have a list of $a $b values which can go from (-180 --- 180) 

For example:
100 2
-2  44
332 9
26  -4
332 9
0   -1

[download]

I want to creat a 2 dimentional array 360x360 and set it to zero then start recording the count of combnation $a $b the combanation of 332 and 9 appered twice on the list so the count will be 2 

my @a = ((0) x 361);

my @b = ((0) x 361);

my @matrix = (@a,@b)

while ($line = <IN>)
{
@record   = split(/\s+/, $line);
$a = $record[0]; 
$b  = $record[1]; 
@matrix [$a+180][$b+180] ++;
}

[download]
and Yes Ikegami you are right I do understand now why 361 :) thanks

In reply to 2 dimensional array by topaz

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