moving through loop

[eatr]

I want to be able to move through the columns of a dynamic (size varies --nothing constant) 2 dimensional array, making calculations and then changes to the values. The colums would be accessed as pairs.

for example

0 1 2 3 4 5 6 7 ...

a 123 000 ......................

b 456 001 ......................

c 789 012 .......................


In pairs, I want to work first with 1,3, then 2,4 etc.

I've tried embedding foreach loops:

for my $l (1,3) {

for my $m (2,4) {

....

but can't get it to work

suggestions please

 

[KevinADC]

arrays start at 0 (zero) not 1 (one). But I don't understand your question.

- Kevin, perl coder unexceptional!

 

[eatr]

I realize that, that's why I've started with '0' in the heading.

Here's what I want, more specifically:

to loop through the array comparing 2 columns concurrently

if I wanted to work with columns 1,3 first run through

then columns 2,4 2nd run through, etc.

how would I write the for loop

(there will be embedded fors, whiles, and ifs within)

thanks

hope this a bit clearer

 

[KevinADC]

generic example:

my @array = ([1..10],[1..10],[1..10]);
foreach my $line (@array) {
   for my $i (1 .. $#{$line}-1) {
      print "'$line->[$i],$line->[$i+1]'";
   }
   print "\n";
}

- Kevin, perl coder unexceptional!