Beefy Boxes and Bandwidth Generously Provided by pair Networks
Just another Perl shrine
 
PerlMonks  

Re: column major or row major.

by betterworld (Curate)
on Aug 09, 2009 at 11:00 UTC ( #787156=note: print w/replies, xml ) Need Help??


in reply to column major or row major.

Two-dimensional arrays in Perl are implemented either as arrays of array references (where the references may reference arrays that are stored at any arbitrary memory location), or using hashes where there are special separators in the hash keys.

Neither of these methods guarantees the order in which the elements are stored in memory, and there is no straightforward way to iterate over the elements in sequence. Therefore the concept of row major cannot be applied imho.

If one needs a two-dimensional structure on a one-dimensional array, it's usually done by hand as in $array[$row * $columncount + $column]. Maybe one could use operator overloading to access these kinds of arrays with the usual $array[$row][$column] syntax.

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://787156]
help
Chatterbox?
[marinersk]: Poking around I find references to the XP Nodelet but something's not clicking. It shows up when I have votes; it shows up when my XP changes; but I can't see how to make it show up all the time. Am I missing something obvious here?

How do I use this? | Other CB clients
Other Users?
Others chilling in the Monastery: (7)
As of 2017-05-29 13:28 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?