DSTERF(3)

💖 NAME 💖

DSTERF(3) — Library Functions Manual cutie ✨ and the source path is:

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

✨ SYNOPSIS ✨

Functions/Subroutines

       subroutine DSTERF (n, d, e, info)
           DSTERF

🦋 Function/Subroutine Documentation 🦋

   subroutine DSTERF (integer n, double precision, dimension( * ) d, double
       precision, dimension( * ) e, integer info)
       DSTERF

🎀 Purpose 🎀

Okay so bestie, DSTERF computes all eigenvalues of a symmetric tridiagonal matrix using the Pal-Walker-Kahan variant of the QL or QR algorithm. Periodt. ✨

🍓 Parameters 🍓

💅 N

N is INTEGER. It’s the order of the matrix. N >= 0.

💅 D

D is DOUBLE PRECISION array, dimension (N). On entry, the n diagonal elements of the tridiagonal matrix. On exit, if INFO = 0, the eigenvalues in ascending order.

💅 E

E is DOUBLE PRECISION array, dimension (N-1). On entry, the (n-1) subdiagonal elements of the tridiagonal matrix. On exit, E has been destroyed. 😭

💅 INFO

INFO is INTEGER.

• = 0: successful exit
• < 0: if INFO = -i, the i-th argument had an illegal value
• > 0: the algorithm failed to find all of the eigenvalues in a total of 30*N iterations; if INFO = i, then i elements of E have not converged to zero.

👑 Author 👑

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

Definition at line 85 of file dsterf.f.

👑 Author (Doxygen’s little credit) 👑

Generated automatically by Doxygen for LAPACK from the source code.

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kisses from the footer, bestie 🫶: LAPACK Version 3.12.0, and the footer path is /home/abui...RC/dsterf.f(3). The original footer doesn’t list a separate date, so no invented date here — just the version and path above. 💜