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Re: Creating a Slice through a 2 dimensional array

by xdg (Monsignor)
on Sep 29, 2005 at 09:57 UTC ( #496029=note: print w/replies, xml ) Need Help??


in reply to Creating a Slice through a 2 dimensional array

Several issues -- first, your slice isn't a slice. You need @sortarr[0..10]. Second, the content of each element is an array reference -- you need to slice out each part of that. p.272 is throwing you off because it's giving a slice of a row -- you're trying for a slice of a column (in a row-major AoA).

You probably want to use map to extract the subslices. E.g.

my @aoa = ( [1 .. 4], [5 .. 8], [9 .. 12], ); my @column_slice = map { [ $_->[2] ] } @aoa[1,2]; my @two_d_slice = map { [ @{$_}[1,2] ] } @aoa[1,2];

For a column slice, for each element of the slice, @aoa[1,2] (i.e. the rows), this dereferences the array reference to get the column, and returns it as a new anonymous array reference. (This keeps it an AoA; if you want a flattened list, omit the square brackets just inside the map braces.). For two-dimensions, it's similar, but you slice inside the map, too.

-xdg

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