SLATTR(3)

💅 SLATTR(3) — slattr.f(3)

ok so this is a page from the LAPACK Library Functions Manual, and it's literally about one little Fortran file, bestie. buckle up 🎀

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✨ NAME ✨

/home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/TESTING/LIN/slattr.f

yep, that's the whole name section — it's just the file path, no cap. that's our girl. 📁

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✨ SYNOPSIS ✨

🦋 Functions/Subroutines

• subroutine SLATTR (imat, uplo, trans, diag, iseed, n, a, lda, b, work, info) — SLATTR
• SLATTR — also SLATTR. she contains multitudes 💫

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✨ Function/Subroutine Documentation ✨

🌸 subroutine SLATTR

subroutine SLATTR (integer imat, character uplo, character trans, character
    diag, integer, dimension( 4 ) iseed, integer n, real, dimension( lda, *
    ) a, integer lda, real, dimension( * ) b, real, dimension( * ) work,
    integer info)

SLATTR

🎀 Purpose:

!>
!> SLATTR generates a triangular test matrix.
!> IMAT and UPLO uniquely specify the properties of the test
!> matrix, which is returned in the array A.
!>

so basically: she makes you a triangular test matrix 💖 and IMAT + UPLO together are the whole personality of that matrix — they uniquely pick what it's gonna be, and it comes back at you in the array A. iconic behavior honestly.

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🧚 Parameters

• IMAT — IMAT is INTEGER. it's an integer key that says which matrix to generate for this path. like a little menu selection but for matrices 🍓
• UPLO — UPLO is CHARACTER*1. specifies whether the matrix A will be upper or lower triangular.
  • = 'U': Upper triangular
  • = 'L': Lower triangular
• TRANS — TRANS is CHARACTER*1. specifies whether the matrix or its transpose will be used.
  • = 'N': No transpose
  • = 'T': Transpose
  • = 'C': Conjugate transpose (= Transpose)

ngl 'C' just means the same thing here, she said "same vibe" 💅

• DIAG — DIAG is CHARACTER*1. specifies whether or not the matrix A is unit triangular.
  • = 'N': Non-unit triangular
  • = 'U': Unit triangular
• ISEED — ISEED is INTEGER array, dimension (4). the seed vector for the random number generator (used in SLATMS). modified on exit — she will change it, that's not a drill 👀
• N — N is INTEGER. the order of the matrix to be generated. how big she is ✨
• A — A is REAL array, dimension (LDA,N). the triangular matrix A. if UPLO = 'U', the leading n by n upper triangular part of the array A contains the upper triangular matrix, and the strictly lower triangular part of A is not referenced. if UPLO = 'L', the leading n by n lower triangular part of the array A contains the lower triangular matrix, and the strictly upper triangular part of A is not referenced. if DIAG = 'U', the diagonal elements of A are set so that A(k,k) = k for 1 <= k <= n. 🫶
• LDA — LDA is INTEGER. the leading dimension of the array A. LDA >= max(1,N). respect the constraint bestie 🚨
• B — B is REAL array, dimension (N). the right hand side vector, if IMAT > 10. conditional queen 💀
• WORK — WORK is REAL array, dimension (3*N). that's it, that's the whole description. she works 💪
• INFO — INFO is INTEGER.
  • = 0: successful exit 🎉
  • < 0: if INFO = -k, the k-th argument had an illegal value 😭

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👑 Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

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⭐ Definition

at line 131 of file slattr.f. noted, so you can go find her in the wild 🔍

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🌈 Author

Generated automatically by Doxygen for LAPACK from the source code. so nobody hand-wrote this, the machine did it, and honestly? she ate 🤖✨

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lowkey reminder: every number, every flag, every 'U' and 'L' above is exactly as written — don't go freestyling your arguments, the vibe check is strict here 🧿

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that's the whole page, bestie — mwah 💋

this has been LAPACK, Version 3.12.0, dated /home/abui...IN/slattr.f(3) — catch you in the next manpage, love u, bye 🫶🎀