[SciPy-user] Array Bounds
Steven H. Rogers
steve at shrogers.com
Sat Mar 10 13:36:21 EST 2007
John Hassler wrote:
> There is no way to make everybody happy, I'm afraid. Early Fortran was
> one-based. A text I used to use (Carnahan, et al, "Applied Numerical
> Methods," 1969) warns of the difficulty of translating mathematical sums
> starting with zero to Fortran indices starting with 1. On the other
> hand, Press, et al., "Numerical Recipes in C," 1988, 1992, spend an
> entire page justifying their practice of converting all C arrays to
> one-based. (This, by the way, has been roundly criticized by "real" C
> programmers.)
>
> Pascal, Fortran 77, and perhaps other 'modern' languages, allow
> specifying both ends of the range, as in x[2:7] or something. Some
> people like this. I find that it's just one more thing to keep track
> of. (By this I mean, if you see x[4] somewhere in a program, you have
> to look back at the declaration to know what it means.) I suppose that
> something like this in Python would also require that one ALWAYS specify
> both ends of range().
>
For casual use, many would find it convenient to be able to change from
0-based to 1-based indexing (APL allows this). For larger programs
touched by multiple programmers over time, it's a maintenance issue.
# Steve
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