TESTING/LIN/dlattr.f(3)

🦋 NAME 🦋

TESTING/LIN/dlattr.f — bestie, that's the page name. It's chillin' under the Library Functions Manual banner, and yes, the full page title situation is TESTING/LIN/dlattr.f(3). iykyk.

✨ SYNOPSIS ✨

🧚 Functions/Subroutines 🧚

• subroutine dlattr (imat, uplo, trans, diag, iseed, n, a, lda, b, work, info) — DLATTR

🌈 Function/Subroutine Documentation 🌈

Okay so here's the exact 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 — main character energy.

💖 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. Slay.

🎀 Parameters 🎀

• IMAT — okay so 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. Don't forget that part.
• 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.

👑 Author 👑

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