Re: Who uses clapack?

From: Allin Cottrell (cottrell_at_wfu.edu)
Date: 12/11/04

  • Next message: Jentje Goslinga: "Re: Who uses clapack?" 
    Date: Fri, 10 Dec 2004 21:12:18 -0500

    Dan Pop wrote:
    > In <1gokq2z.1qtze21fbcwaoN%see.sig@for.addy> see.sig@for.addy (Victor Eijkhout) writes:
    >
    >
    >>The authors of lapack/scalapack are starting to work on a new release of
    >>these packages. One of the things we want to address is the sillyness
    >>that C users, instead of linking to the binaries of the Fortran version,
    >>use an automatically translated C version.
    >>
    >>Therefore we'd like to know precisely what the reasons for this are.
    >>
    >>Naively one would say, compile the Fortran version, append an underscore
    >>(when appropriate) to routine names, and just link those libraries to
    >>your object files.
    >>
    >>What are the gotchas, and what are the real stumbling blocks here?
    >>Please spell it out in as much detail as you can muster. This situation
    >>really needs to improve.
    >
    >
    > The issue that springs to mind is that Fortran and C store matrices
    > differently: Fortran does it column-wise (the first index varies fastest),
    > C does it row-wise (the last index varies fastest).

    I don't think that is the issue, since the clapack translation (as I
    understand it) is not an idiomatic translation into C (actually, that
    would be much too confusing, if you think about it). It's a perfectly
    literal translation, which preserves Fortan-style array indexing by
    brutal mangling of C notation.

    Allin Cottrell
    Wake Forest University

  • Next message: Jentje Goslinga: "Re: Who uses clapack?"

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