ZGET01(3)

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💅 NAME

/home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/TESTING/LIN/zget01.f

🦋 SYNOPSIS

✨ Functions/Subroutines

subroutine ZGET01 (m, n, a, lda, afac, ldafac, ipiv, rwork, resid)
    ZGET01

🫶 Function/Subroutine Documentation

subroutine ZGET01 (integer m, integer n, complex*16, dimension( lda, * ) a,
       integer lda, complex*16, dimension( ldafac, * ) afac, integer ldafac,
       integer, dimension( * ) ipiv, double precision, dimension( * ) rwork,
       double precision resid)
       ZGET01

🌸 Purpose

ZGET01 reconstructs a matrix A from its L*U factorization and computes the residual:

norm(L*U - A) / ( N * norm(A) * EPS ),
where EPS is the machine epsilon.

🎀 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*16 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*16 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 ZGETRF. 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 ZGETRF.
• RWORK — RWORK is DOUBLE PRECISION array, dimension (M).
• RESID — RESID is DOUBLE PRECISION; 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 zget01.f.

👑 Author

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