SGEBAK(3)

💅 SGEBAK(3) — Library Functions Manual 💅

okay so bestie, this is the SGEBAK(3) page and she is iconic. We're gonna go through every single deet, no cap. 🫶✨

🌸 NAME 🌸

/home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/SRC/sgebak.f — yes, that exact path. Periodt. 💖

✨ SYNOPSIS ✨

🧚 Functions/Subroutines 🧚

• subroutine SGEBAK (job, side, n, ilo, ihi, scale, m, v, ldv, info) — SGEBAK, the main character herself.

💫 Function/Subroutine Documentation 💫

📜 The signature 📜

   subroutine SGEBAK (character job, character side, integer n, integer ilo,
       integer ihi, real, dimension( * ) scale, integer m, real, dimension(
       ldv, * ) v, integer ldv, integer info)

SGEBAK 💅

🎯 Purpose 🎯

SGEBAK forms the right or left eigenvectors of a real general matrix by backward transformation on the computed eigenvectors of the balanced matrix output by SGEBAL. That's the whole vibe. ✨

🔧 Parameters 🔧

JOB

JOB is CHARACTER*1. It specifies the type of backward transformation required:

• = 'N': do nothing, return immediately;
• = 'P': do backward transformation for permutation only;
• = 'S': do backward transformation for scaling only;
• = 'B': do backward transformations for both permutation and scaling.

JOB must be the same as the argument JOB supplied to SGEBAL. iykyk. 💅

SIDE

SIDE is CHARACTER*1.

• = 'R': V contains right eigenvectors;
• = 'L': V contains left eigenvectors.

N

N is INTEGER. The number of rows of the matrix V. N >= 0.

ILO

ILO is INTEGER.

IHI

IHI is INTEGER. The integers ILO and IHI determined by SGEBAL. 1 <= ILO <= IHI <= N, if N > 0; ILO=1 and IHI=0, if N=0.

SCALE

SCALE is REAL array, dimension (N). Details of the permutation and scaling factors, as returned by SGEBAL.

M

M is INTEGER. The number of columns of the matrix V. M >= 0.

V

V is REAL array, dimension (LDV,M). On entry, the matrix of right or left eigenvectors to be transformed, as returned by SHSEIN or STREVC. On exit, V is overwritten by the transformed eigenvectors.

LDV

LDV is INTEGER. The leading dimension of the array V. LDV >= max(1,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 128 of file sgebak.f.

🌈 Author 🌈

Generated automatically by Doxygen for LAPACK from the source code.

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