SRC/zsyconv.f(3)

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version 3.12.1 · 4 versions
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🌸 NAME 🌸

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✨ SYNOPSIS ✨

Functions/Subroutines

  • subroutine zsyconv (uplo, way, n, a, lda, ipiv, e, info) — ZSYCONV

🎀 Function/Subroutine Documentation 🎀

Here's the subroutine in full signature mode, no cap:

subroutine zsyconv (character uplo, character way, integer n, complex*16,
    dimension( lda, * ) a, integer lda, integer, dimension( * ) ipiv,
    complex*16, dimension( * ) e, integer info)

ZSYCONV

💖 Purpose 💖

Bestie, ZSYCONV converts an A given by ZHETRF into L and D — or vice-versa. It gets the nondiagonal elements of D (those come back in the workspace) and applies or reverses the permutation done in TRF. ✨

🦋 Parameters 🦋

  • UPLO — is CHARACTER*1. Tells you whether the details of the factorization are stored as an upper or lower triangular matrix. = 'U': upper triangular, form is A = U*D*U**T; = 'L': lower triangular, form is A = L*D*L**T.
  • WAY — is CHARACTER*1. = 'C': Convert; = 'R': Revert.
  • N — is INTEGER. The order of the matrix A. N >= 0.
  • A — is COMPLEX*16 array, dimension (LDA,N). The block diagonal matrix D and the multipliers used to obtain the factor U or L as computed by ZSYTRF.
  • LDA — is INTEGER. The leading dimension of the array A. LDA >= max(1,N).
  • IPIV — is INTEGER array, dimension (N). Details of the interchanges and the block structure of D as determined by ZSYTRF.
  • E — is COMPLEX*16 array, dimension (N). E stores the supdiagonal/subdiagonal of the symmetric 1-by-1 or 2-by-2 block diagonal matrix D in LDLT.
  • 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 113 of file zsyconv.f.

👑 Author 👑

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