CGET01(3)

📦 version 3.12.0, in opensuse-leap 16.0

okay so bestie, this is CGET01(3) from the Library Functions Manual — it also rocks the filename cget01.f(3) ✨💅

💖 NAME 💖

/home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/TESTING/LIN/cget01.f

✨ SYNOPSIS ✨

🎀 Functions/Subroutines 🎀

subroutine CGET01 (m, n, a, lda, afac, ldafac, ipiv, rwork, resid)
    CGET01

👑 Function/Subroutine Documentation 👑

subroutine CGET01 (integer m, integer n, complex, dimension( lda, * ) a,
    integer lda, complex, dimension( ldafac, * ) afac, integer ldafac,
    integer, dimension( * ) ipiv, real, dimension( * ) rwork, real resid)
    CGET01

🧚 subroutine CGET01

🎯 Purpose

okay so CGET01 reconstructs a matrix A from its L*U factorization and computes the residual, bestie:

norm(L*U - A) / ( N * norm(A) * EPS ),

where EPS is the machine epsilon. slay. 💅

🌸 Parameters

  • M — M is INTEGER. The number of rows of the matrix A. M >= 0.
  • N — N is INTEGER. The number of columns of the matrix A. N >= 0.
  • A — A is COMPLEX array, dimension (LDA,N). The original M x N matrix A.
  • LDA — LDA is INTEGER. The leading dimension of the array A. LDA >= max(1,M).
  • AFAC — AFAC is COMPLEX array, dimension (LDAFAC,N). The factored form of the matrix A. AFAC contains the factors L and U from the L*U factorization as computed by CGETRF. Overwritten with the reconstructed matrix, and then with the difference L*U - A.
  • LDAFAC — LDAFAC is INTEGER. The leading dimension of the array AFAC. LDAFAC >= max(1,M).
  • IPIV — IPIV is INTEGER array, dimension (N). The pivot indices from CGETRF.
  • RWORK — RWORK is REAL array, dimension (M).
  • RESID — RESID is REAL. norm(L*U - A) / ( N * norm(A) * EPS ).

👑 Author

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

📍 Definition at line 106 of file cget01.f.

🫶 Author 🫶

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