How to make matrix?

[jovimarko]

I’ve been given a file
1 2 15
1 3 16
2 3 20
and so on…First two values of the input file represents graph nodes and the third one is distance between them. I know the number of nodes(in previous example number of nodes is 4, counting starts from 0)
I need perl code that makes a matrix that looks like this:
0 0 0 0
0 0 15 16
0 15 0 20
0 16 20 0
Thanks in advance!!!!!

[miller]

Read the tutorial on complex data structures. There's a section specifically on "Arrays of Arrays"

http://perldoc.perl.org/perldsc.html#ARRAYS-OF-ARRAYS-array-of-arrays-AoA

[KevinADC]

Check your PM's Miller.