That indeed showed me the values as expected. So, in the case of a 2D array, the return statement returns the array of array of references instead of the array of array of values. Is that right? If so, I need some advice because I then use this 2D array as input to the next sub which multiplies two matrices. I show part of the main code and sub code below -

@rot_mat1=eul2mat($data_doc1[$i],$data_doc1[$i+1],$data_doc1[$i+2]);
        @rot_mat2=eul2mat($data_doc2[$i],$data_doc2[$i+1],$data_doc2[$
+i+2]);

@cbn_mat=mat_multiply(\@rot_mat1,\@rot_mat2);

sub eul2mat {
        my $phi_rad=deg2rad($_[0]);
        my $theta_rad=deg2rad($_[1]);
        my $psi_rad=deg2rad($_[2]);
        print "$phi_rad $theta_rad $psi_rad\n";
        my @rot_mat;
        $rot_mat[0][0]=cos($phi_rad)*cos($theta_rad)*cos($psi_rad)-sin
+($phi_rad)*sin($psi_rad);
        $rot_mat[0][1]=cos($phi_rad)*cos($theta_rad)*sin($psi_rad)+sin
+($phi_rad)*cos($psi_rad);
        $rot_mat[0][2]=-cos($phi_rad)*sin($theta_rad);
        $rot_mat[1][0]=-sin($phi_rad)*cos($theta_rad)*cos($psi_rad)-si
+n($psi_rad)*cos($phi_rad);
        $rot_mat[1][1]=-sin($phi_rad)*cos($theta_rad)*sin($psi_rad)+co
+s($phi_rad)*cos($psi_rad);
        $rot_mat[1][2]=sin($phi_rad)*sin($theta_rad);
        $rot_mat[2][0]=sin($theta_rad)*cos($psi_rad);
        $rot_mat[2][1]=sin($theta_rad)*sin($psi_rad);
        $rot_mat[2][2]=cos($theta_rad);
        say Dumper @rot_mat;
        return \@rot_mat;
}

sub mat_multiply {
        my ($mat1,$mat2)=@_;
        my ($i,$j,$k);
        my $result_mat=[];
        for $i (0..2) {
                for $j (0..2) {
                        for $k (0..2) {
                                $result_mat->[$i][$j]+=$mat1->[$i][$k]
+ * $mat2->[$k][$j];
                        }
                }
        }
        return $result_mat;
}
[download]

So I return the array of array of references in the first two lines. But I need to pass these two arrays to the next sub. Am I making a mistake there?

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.