Basic HTML version of Foils prepared March 30 97

Foil 19 Arrays and Lists of Scalars(data) IV -- Element Access (Chapter 3 of Llama Book)

From PERL4 Tutorial for CPS616 Computational Science for Information Age Course CPS616 -- February 1995. by Geoffrey C. Fox
1 Note that @fred and $fred are totally different variables -- one an array and the other a scalar
2 However the elements of @fred are scalars and like C are labelled starting at 0 not 1 (as in Fortran) -- such elements are referenced by $ NOT @
  • $a = $fred[0]; # is first element in @fred which we can set explicitly by
  • $fred[0]= "First element of \@fred"; # note get variable interpolation for arrays as well as scalars and so one must "escape(protect)" @ in string
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