[clean-list] FFT and Clean
Mon, 27 Aug 2001 12:17:42 +1000
On Mon, Aug 27, 2001 at 01:54:11PM +1200, Richard A. O'Keefe didst scribe:
> Siegfried Gonzi <email@example.com> wrote:
> - You should be aware that the Numerical Recipes C code is using
> one-offset (as Fortran) and not zero-offset. This is
> also accounted for when you pass the vector to the fft subroutine, then
> you have to pass it with pointer beeing
> decremented by 1. Completely mad.
> It is also completely illegal in C. In C you may form a pointer to
> any element of an array, and also to the non-existent element just past
> the end of the array (although that pointer may not be dereferenced).
> It has never been legal in C to form a pointer that points _before_ an array.
I never thought that legality was a strong part of the c programmers ethic. More
of a case of "what ever gets past the compiler". Heh. ;)
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