CLATTP(3)

📦 version 3.12.0, in opensuse-leap 16.0

hey bestie 💖 okay so we're looking at the Library Functions Manual page for clattp.f(3) — and no, it's not a typo, it's LAPACK's CLATTP and she's iconic. let's get into it 🎀

🌸 NAME 🌸

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

✨ SYNOPSIS ✨

Functions/Subroutines

subroutine CLATTP (imat, uplo, trans, diag, iseed, n, ap, b, work,
    rwork, info)
    CLATTP

🦋 Function/Subroutine Documentation 🦋

subroutine CLATTP (integer imat, character uplo, character trans, character
    diag, integer, dimension( 4 ) iseed, integer n, complex, dimension( * )
    ap, complex, dimension( * ) b, complex, dimension( * ) work, real,
    dimension( * ) rwork, integer info)
    CLATTP

Purpose

okay so CLATTP generates a triangular test matrix in packed storage. IMAT and UPLO uniquely specify the properties of the test matrix, which is returned in the array AP. that's it, that's the vibe ✨

Parameters

IMAT

IMAT is INTEGER. an integer key describing which matrix to generate for this path. think of it as the little matrix menu 🍓

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

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 CLATMS). modified on exit.

N

N is INTEGER. the order of the matrix to be generated.

AP

AP is COMPLEX 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 COMPLEX array, dimension (N). the right hand side vector, if IMAT > 10.

WORK

WORK is COMPLEX array, dimension (2*N).

RWORK

RWORK is REAL array, dimension (N).

INFO

INFO is INTEGER.

  • = 0: successful exit
  • < 0: if INFO = -i, the i-th argument had an illegal value

Author 🌸

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 129 of file clattp.f.

Author ✨

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