I found a curious situation when running pdl, as illustrated in the
following example. I build two singular 3x3 matrices and calculate
their determinant, which is zero. However, in one case I get a PDL
scalar and in the other I get a Perl scalar. I don't know why the
different behaviour:
# Program
use v5.36;
use PDL;
my $m1=pdl[[-2,-2,-2], [-1,-2,-2], [0,-2,-2]];
my $m2=pdl[[-2,-2,-2],[-1,-1,-2],[0,0,-2]];
for($m1, $m2){
say "Matrix=$_", "Det=", $_->det, "\nRef=", ref $_->det;
}
#Results:
Matrix=
[
[-2 -2 -2]
[-1 -2 -2]
[ 0 -2 -2]
]
Det=0
Ref=PDL
Matrix=
[
[-2 -2 -2]
[-1 -1 -2]
[ 0 0 -2]
]
Det=0
Ref=
I'm currently running PDL v2.081 under Perl 5.36 in Linux/testing.
Best regards,
Luis
--
o
W. Luis Mochán, | tel:(52)(777)329-1734 /<(*)
Instituto de Ciencias Físicas, UNAM | fax:(52)(777)317-5388 `>/ /\
Av. Universidad s/n CP 62210 | (*)/\/ \
Cuernavaca, Morelos, México | moc...@fis.unam.mx /\_/\__/
GPG: 791EB9EB, C949 3F81 6D9B 1191 9A16 C2DF 5F0A C52B 791E B9EB
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