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Compare this code (which works) with your version and ask questions about any differences you do not understand:

#!/usr/bin/perl use strict; use warnings; use Data::Dumper; my @unsortedData = ( 5, 4, 7, 2, 1, 3, 6, 9, 8, 10 ); # show the original data to screen for( @unsortedData ) { print "$_ "; } print "\n"; my $sortedData = mergeSort( \@unsortedData ); # show the new data to screen for( @$sortedData ) { print "$_ "; } print "\n"; ### dereferencing of arrays isnt working in below method sub mergeSort { my ( $data ) = @_; if( @$data < 2 ) { return $data; } # if there is less then two it +ems it's already sorted!! use integer; #split the array into two parts my $middle = @$data / 2; print "middle: $middle\n"; my @leftSide = (); print "LeftSide:\n"; for( my $i = 0; $i < $middle; $i++ ) { $leftSide[$i] = @$data[$i]; print "$leftSide[$i] "; } print "\n"; my @rightSide = (); print "RightSide:\n"; for( my $i = $middle; $i < @$data; $i++ ) { $rightSide[$i - $middle] = @$data[$i]; print "$rightSide[$i - $middle] "; } print "\n"; mergeSort( \@leftSide ); mergeSort( \@rightSide ); merge( \@leftSide, \@rightSide, $data ); return $data; } sub merge { my ( $groupA, $groupB, $dataRef ) = @_; my $i = 0; my $j = 0; my $k = 0; while( $i < @$groupA && $j < @$groupB ) { if( $groupA->[$i] <= $groupB->[$j] ) { @$dataRef[$k] = $groupA->[$i]; $i++; } else { @$dataRef[$k] = $groupB->[$j]; $j++; } $k++; } while( $i < @$groupA ) { @$dataRef[$k] = $groupA->[$i]; $i++; $k++; } while( $j < @$groupB ) { @$dataRef[$k] = $groupB->[$j]; $j++; $k++; } }

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In reply to Re^3: Dereferencing arrays by BrowserUk
in thread <SOLVED>Dereferencing arrays by divitto

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