CHETRI(3)

🎀 CHETRI(3) 🎀

okay so this is the Library Functions Manual page for CHETRI(3), and we’re jumping straight into the NAME section, bestie.

💖 NAME 💖

The NAME is literally this file path:

/home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/SRC/chetri.f

✨ SYNOPSIS ✨

🦋 Functions/Subroutines 🦋

• subroutine CHETRI (uplo, n, a, lda, ipiv, work, info) — CHETRI

💅 Function/Subroutine Documentation 💅

   subroutine CHETRI (character uplo, integer n, complex, dimension( lda, * )
       a, integer lda, integer, dimension( * ) ipiv, complex, dimension( * )
       work, integer info)
       CHETRI

🦋 Purpose 🦋

Bestie, CHETRI computes the inverse of a complex Hermitian indefinite matrix A using the factorization A = U*D*U**H or A = L*D*L**H computed by CHETRF. periodt.

🌸 Parameters 🌸

• UPLO — UPLO is CHARACTER*1. It specifies whether the details of the factorization are stored as an upper or lower triangular matrix.
  • = 'U': Upper triangular, form is A = U*D*U**H;
  • = 'L': Lower triangular, form is A = L*D*L**H.
• N — N is INTEGER. The order of the matrix A. N >= 0.
• A — A is COMPLEX array, dimension (LDA,N). On entry, the block diagonal matrix D and the multipliers used to obtain the factor U or L as computed by CHETRF. On exit, if INFO = 0, the (Hermitian) inverse of the original matrix. If UPLO = 'U', the upper triangular part of the inverse is formed and the part of A below the diagonal is not referenced; if UPLO = 'L' the lower triangular part of the inverse is formed and the part of A above the diagonal is not referenced.
• LDA — LDA is INTEGER. The leading dimension of the array A. LDA >= max(1,N).
• IPIV — IPIV is INTEGER array, dimension (N). Details of the interchanges and the block structure of D as determined by CHETRF.
• WORK — WORK is COMPLEX array, dimension (N).
• INFO — INFO is INTEGER.
  • = 0: successful exit
  • < 0: if INFO = -i, the i-th argument had an illegal value
  • > 0: if INFO = i, D(i,i) = 0; the matrix is singular and its inverse could not be computed.

👑 Author 👑

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

Definition at line 113 of file chetri.f.

💻 Author 💻

Generated automatically by Doxygen for LAPACK from the source code.

---

that’s the whole page, bestie — LAPACK Version 3.12.0, file /home/abui...RC/chetri.f(3). 💅