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That implies you intend to have 3 hashes, one for each of x, y & z. Parallel data structures are not (generally) a good idea as they can get out of sync and you're stuffed. Going by the line diagram, you'd be better off with something that allowed you to do:

my %line = ( lineNameA => { StationA => [ xxx.xx, yyy.yy, zzz.zz ], StationB => [ xxx.xx, yyy.yy, zzz.zz ], ... }, lineNameB => { ... ); my( $x, $y, $z ) = $line{ $lineName }{ $stationName }; # Or use constant{ X => 0, Y => 1, Z => 2 }; my $y = $line[ $lineNo ][ $staionNo ][ Y ];

That's assuming the the identifiers are names not numbers.

If they are numbers, or names of the form "line_003" and "station_12", (low, mostly sequential number postfixes ),

then you'd save some memory and be a tad quicker to use arrays instead of hashes:

my @line = ( [ ## $line[ 0 ] [, yyy.yyy, zzz.zzz ], ## $line[0][0] (station 0) [, yyy.yyy, zzz.zzz ], ## (station 1) [, yyy.yyy, zzz.zzz ], ... ], [ ## Line[ 1 ] [, yyy.yyy, zzz.zzz ], ## Line[ 1 ][ 0 ] [, yyy.yyy, zzz.zzz ], [, yyy.yyy, zzz.zzz ], ... ], ... ); my( $x, $y, $z ) = $line[ $lineNo ][ $stationNo ]; # Or use constant{ X => 0, Y => 1, Z => 2 }; my $y = $line[ $lineNo ][ $staionNo ][ Y ];

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re: Data Structures by BrowserUk
in thread Data Structures by YYCseismic

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