DLATTB(3)

💖 DLATTB(3) — Library Functions Manual 💖

okay bestie, welcome to the Library Functions Manual page for DLATTB — yes, the whole vibe is Fortran test-matrix generation, and honestly? iconic. 💅

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✨ NAME ✨

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

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🦋 SYNOPSIS 🦋

🌸 Functions/Subroutines 🌸

subroutine DLATTB (imat, uplo, trans, diag, iseed, n, kd, ab, ldab, b,
    work, info)
    DLATTB

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🫶 Function/Subroutine Documentation 🫶

subroutine DLATTB (integer imat, character uplo, character trans, character
    diag, integer, dimension( 4 ) iseed, integer n, integer kd, double
    precision, dimension( ldab, * ) ab, integer ldab, double precision,
    dimension( * ) b, double precision, dimension( * ) work, integer info)
    DLATTB

🎀 Purpose 🎀

okay so DLATTB generates a triangular test matrix in 2-dimensional storage. IMAT and UPLO are the duo that uniquely specify the properties of the test matrix, and the matrix 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. It specifies whether the matrix A will be upper or lower triangular, bestie:
  • = 'U': Upper triangular
  • = 'L': Lower triangular
• TRANS — TRANS is CHARACTER*1. It specifies whether the matrix or its transpose will be used:
  • = 'N': No transpose
  • = 'T': Transpose
  • = 'C': Conjugate transpose (= transpose)
• DIAG — DIAG is CHARACTER*1. It specifies whether or not the matrix A is unit triangular:
  • = 'N': Non-unit triangular
  • = 'U': Unit triangular
• ISEED — ISEED is INTEGER array, dimension (4). It’s 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. 📏
• KD — KD is INTEGER. The number of superdiagonals or subdiagonals of the banded triangular matrix A. KD >= 0. 🚨
• AB — AB is DOUBLE PRECISION array, dimension (LDAB,N). It’s the upper or lower triangular banded matrix A, stored in the first KD+1 rows of AB. Let j be a column of A, 1<=j<=n.

If UPLO = 'U', AB(kd+1+i-j,j) = A(i,j) for max(1,j-kd)<=i<=j.
If UPLO = 'L', AB(1+i-j,j)    = A(i,j) for j<=i<=min(n,j+kd).

• LDAB — LDAB is INTEGER. The leading dimension of the array AB. LDAB >= KD+1. 🚨
• B — B is DOUBLE PRECISION array, dimension (N). 🫶
• WORK — WORK is DOUBLE PRECISION array, dimension (2*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 133 of file dlattb.f.

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🌈 Author 🌈

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xoxo, this page is LAPACK Version 3.12.0 💖 — footer path tag: /home/abui...IN/dlattb.f(3). No date was printed, and I’m not inventing one 🙈