DLATTR(3)

🌸 NAME 🌸

Okay bestie, you're on the <pink>dlattr.f(3)</pink> page from the <lavender>Library Functions Manual</lavender>, and the file this page is about is literally:

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

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✨ SYNOPSIS ✨

The synopsis says Functions/Subroutines and gives you this exact vibe:

   Functions/Subroutines
       subroutine DLATTR (imat, uplo, trans, diag, iseed, n, a, lda, b, work,
           info)
           DLATTR

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💖 FUNCTION/SUBROUTINE DOCUMENTATION 💖

Here's the full signature, no cap:

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

🦋 Purpose 🦋

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

🧚 Parameters 🧚

• IMAT — IMAT is INTEGER. It's an integer key describing which matrix to generate for this path.
• 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)
• 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 DLATMS). Modified on exit.
• N — N is INTEGER. The order of the matrix to be generated.
• A — A is DOUBLE PRECISION 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).
• B — B is DOUBLE PRECISION array, dimension (N). The right hand side vector, if IMAT > 10.
• WORK — WORK is DOUBLE PRECISION array, dimension (3*N).
• INFO — INFO is INTEGER
  • = 0: successful exit
  • < 0: if INFO = -k, the k-th argument had an illegal value

👑 Author 👑

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

Definition: at line 131 of file dlattr.f.

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👑 AUTHOR 👑

Generated automatically by Doxygen for LAPACK from the source code.

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Okay that's the whole page, bestie. This gem is tagged LAPACK Version 3.12.0, and the source path in the footer is /home/abui...IN/dlattr.f(3). Stay triangular, stay iconic 💅✨🦋