Basic HTML version of Foils prepared Sept 20 97

Foil 22 The -> Pointer Notation -- I

From Perl5 and Advanced Perl4 Features Computational Science for Information Age Course CPS616 -- Sept 20 97. by Geoffrey C. Fox,Nancy McCracken,Tom Scavo
$LoL2D[$i][$j] can be written equivalently as$LoL2D[$i]->[$j] but
NOT $LoL2D->[$i]->[$j] or $LoL2D->[$i][$j]
as left hand side of -> MUST be a reference and NOT an array or hash
$ref_to_LoL2D = \@LoL2D; # is allowed and now
access by $ref_to_LoL2D->[$i][$j] or $ref_to_LoL2D->[$i]->[$j]
Note [ .. ] or { .. } create anonymous arrays or hashs respectively which can be assigned to a reference and then dereferenced by ->
( .. ) constructs a list which can be assigned to an Array or Hash

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