xerbla_array.f(3)

💅 xerbla_array.f — LAPACK bestie edition ✨

okay so this page is straight out of the LAPACK manual (yes, the big one), and it's about one tiny little helper subroutine that's lowkey a legend. sit down, grab a strawberry drink 🍓, and let's get into it.

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✨ NAME ✨

xerbla_array.f — that's the file, that's the vibe. periodt.

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🎀 SYNOPSIS 🎀

Functions/Subroutines

• subroutine xerbla_array (SRNAME_ARRAY, SRNAME_LEN, INFO) — XERBLA_ARRAY, the icon herself 👑

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🦋 Function/Subroutine Documentation 🦋

subroutine xerbla_array (character(1), dimension(srname_len) SRNAME_ARRAY,
    integer SRNAME_LEN, integer INFO)

XERBLA_ARRAY. no cap, that's the whole name.

💖 Purpose 💖

okay so here's the tea: XERBLA_ARRAY assists other languages in calling XERBLA, the LAPACK and BLAS error handler. it's literally the bridge friend 🫶.

so instead of taking a Fortran string argument as the function's name, XERBLA_ARRAY takes an array of single characters along with the array's length. then XERBLA_ARRAY copies up to 32 characters of that array into a Fortran string and passes that to XERBLA. and if you call it with a non-positive SRNAME_LEN, XERBLA_ARRAY will call XERBLA with a string of all blank characters — like, an empty vibe, but make it legal 🙈.

say some macro or other device makes XERBLA_ARRAY available to C99 by a name lapack_xerbla and with a common Fortran calling convention. then a C99 program could invoke XERBLA via:

{
  int flen = strlen(__func__);
  lapack_xerbla(__func__, &flen, &info);
}

and honestly? iconic.

🫧 heads up bestie: providing XERBLA_ARRAY is not necessary for intercepting LAPACK errors. XERBLA_ARRAY calls XERBLA. that's it, that's the whole relationship.

🌸 Parameters 🌸

• SRNAME_ARRAY — CHARACTER(1) array, dimension (SRNAME_LEN). the name of the routine which called XERBLA_ARRAY. like a little name tag at a party 🎀.
• SRNAME_LEN — INTEGER. the length of the name in SRNAME_ARRAY. how many characters we're working with, fr fr.
• INFO — INTEGER. the position of the invalid parameter in the parameter list of the calling routine. the culprit's seat number 💀.

👑 Author 👑

• Univ. of Tennessee
• Univ. of California Berkeley
• Univ. of Colorado Denver
• NAG Ltd.

four whole institutions, main character energy 🌈.

⭐ Date ⭐

December 2016. vintage. retro. a classic 💜.

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🧚 Definition 🧚

Definition at line 82 of file BLAS/SRC/xerbla_array.f.

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🍓 Author 🍓

Generated automatically by Doxygen for LAPACK from the source code. not a human, just a very efficient little robot 🎀✨.

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and that's the whole page!! huge thank you to Version 3.8.0, dated Tue Nov 14 2017, for sponsoring this read 💖 slay, bye bestie 👋💅