The "pdl" constructor does not replicate values to match dimensions
but pads them instead. In contrary, "cat" works as expected:
pdl> do_print 1
1
pdl> $v = sequence 2
[0 1]
pdl> cat $v(,*1), $v(*1,)
[
[
[0 1]
[0 1]
]
[
[0 0]
[1 1]
]
]
Best regards,
-jo
On Tue 19 Aug 2025 07:09:32 PM CEST, Luis Mochan <[email protected]> wrote:
I'm confused by variations of the following program:
use v5.36;
use PDL;
use PDL::NiceSlice;
my $v=sequence(2);
my $m=pdl($v->slice(":,*2"), $v->slice("*2,:"));
say $m;
The output is
[
[
[0 1]
[0 1]
]
[
[0 0]
[1 1]
]
]
which is what I expected. But after a small change:
use v5.36;
use PDL;
use PDL::NiceSlice;
my $v=sequence(2);
my $m=pdl($v->slice(":,*"), $v->slice("*,:"));
say $m;
the output becomes
[
[
[0 1]
[0 0]
]
[
[0 0]
[1 0]
]
]
The same if I replace * by *1. Was I wrong to expect the same output?
I expected the dummy dimension of size 1 (or unspecified size) would
lead to the initial array [0 1] being replicated as many times as
required by the actual dimensions of the other arrays.
Best regards,
Luis
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