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Notes for SWAP

  1. Performs $x \leftrightarrow y$
  2. An index file input line looks like:
    <ID> <incX> <incY> <source file> <author name>
  3. For unit stride case, the complex routine calls the real equivalent with N*2.
  4. The main use of this routine that I am aware of is row-swapping in factorizations, so this is one routine that it would make sense to optimize the arbitrary increment cases, if it were possible.

R. Clint Whaley 2001-08-04