extract a column from 2 dimensional array

[ravi]

How to pick a column into a seperate 1-D array, from a 2-D array. Is
there an efficient way to do this or we have to only iterate each
elements

 

[Gunnar Hjalmarsson]

How to pick a column into a seperate 1-D array, from a 2-D array.
Is there an efficient way to do this or we have to only iterate
each elements

Illustrate what you mean by posting a simple example.

 

[Anno Siegel]

How to pick a column into a seperate 1-D array, from a 2-D array. Is
there an efficient way to do this or we have to only iterate each
elements

Unless your array is stored by columns (the specification "2-D array"
is ambiguous), you will have to loop:

map $array->[ $_]->[ $column], 0 .. $#array;

Perl 6 will have multidimensional slices, one hears. Perl 5 doesn't.

Anno

 

[Andres Monroy-Hernandez]

If I understand correctly you have:
my @two_d_array = ( [an, array], [yet, another, one]);

and you want the column $i:
my @one_d_array = map { $_->[$i] } @two_d_array;

Regards