TESTING/LIN/dlattp.f(3)

💖 NAME 💖

Okay so this page is TESTING/LIN/dlattp.f(3) from the Library Functions Manual, and it’s literally the doc for TESTING/LIN/dlattp.f — the main character here is dlattp, a triangular test-matrix generator. No cap. 🫶

✨ SYNOPSIS ✨

🌸 Functions/Subroutines 🌸

subroutine dlattp (imat, uplo, trans, diag, iseed, n, a, b, work, info)
    DLATTP

🦋 Function/Subroutine Documentation 🦋

💫 subroutine dlattp 💫

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

DLATTP

🎯 Purpose 🎯

Bestie, here’s the vibe: DLATTP generates a triangular test matrix in packed storage. IMAT and UPLO uniquely specify the properties of the test matrix, and it’s returned in the array AP. 💅

🎀 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 (N*(N+1)/2). The upper or lower triangular matrix A, packed columnwise in a linear array. The j-th column of A is stored in the array AP as follows:
  • if UPLO = 'U', AP((j-1)*j/2 + i) = A(i,j) for 1<=i<=j;
  • if UPLO = 'L', AP((j-1)*(n-j) + j*(j+1)/2 + i-j) = A(i,j) for j<=i<=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 123 of file dlattp.f.

👑 Author 👑

Generated automatically by Doxygen for LAPACK from the source code.

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💖 That’s the whole vibe, bestie. Footer tea: LAPACK Version 3.12.0, page TESTING/LIN/dlattp.f(3). There’s no date listed on this one, so I’m not making one up — periodt. 💖