update: added another example. I also will point out that data types within an AoA can be mixed - this can't be done in C! But in Perl it is perfectly ok and used quite often. Maybe a row is like: ("Smith", "Bob", 1932, $ref2otherdata)!
These arrays like @a can of course be built dynamically and the number of columns in each row do not have to be equal - this is called a "ragged array" although here they are. Above shows one way to generate a AoA and note that I didn't use any kind of [x][y] coordinates to either generate the 2-D array or to print it. Perl is designed to do thinks like process the entire row easily.#!/usr/bin/perl -w use strict; my @a = ([1,2,3], [9,8,7,6,5]); print "$a[0][1] the 2 in first row\n"; print "$a[1][3] the 6 in the second row\n"; print "showing another way to make a 2-d thing\n"; # often the syntax that allows access to individual elements just # isn't used as often processing a whole row at once is what is needed my $rows = 3; my $cols = 4; my @x; while ($rows--) { my @rand; push(@rand, int rand(100)) foreach (1..$cols); push (@x, [@rand]); } foreach my $array_ref (@x) { print "@$array_ref\n"; } __END__ prints: 2 the 2 in first row 6 the 6 in the second row 62 44 73 13 11 14 23 73 47 22 40 9
There are other types of Perl data structures that can represent data like what you have given us a hint about and some of these are less obviously 'C' like. It would be helpful if you could provide some additional application data. An AoH is also used often and gets away from stuff like index3 means "name" and avoids this #define name 3 sort of statements or their equivalents that are so prevalent in other languages. Anyway if you have heterogeneous stuff stored in the 2D array, there are some cool ways to deal with that.
In reply to Re: Creating multidimentional arrays dynamically
by Marshall
in thread Creating multidimentional arrays dynamically
by tej
| For: | Use: | ||
| & | & | ||
| < | < | ||
| > | > | ||
| [ | [ | ||
| ] | ] |