Re: How to make like Fortran "do i = 1,20,2"

[tmoran@bix.com]

>When one tries to deal with representing geometry and solve
>differential equations and following some mathematical
>notation, one may want to visit subsets of elements in arrays ?
  Are the subsets inherent and fixed, two sequential items for an x,y
pair for instance, or are they dynamic, arising from the nature of the
algorithm?
  In the first case, as someone suggested, the "Ada way" would be to
make an array of records, or of two-vectors, or simply a two
dimensional array with rows of length two, and step through it from one
row to the next, ie, by one.
  In the second case, if the algorithm calls for stepping by N at a
time, then, as pointed out, that is indeed more easily expressed in
Fortran than in Ada.  It's surely an unusual situation, though.