SSTERF(3)

💖 SSTERF(3) 💖

Okay bestie, welcome to SSTERF(3) from the Library Functions Manual. This is the page for the ssterf.f file, and it’s giving “linear algebra but make it iconic.” 💅

---

🎀 NAME 🎀

The file this page is documenting is:

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

---

✨ SYNOPSIS ✨

Functions/Subroutines 🫶

• subroutine SSTERF (n, d, e, info) — yep, that’s the SSTERF subroutine entry, and it’s the main character here. 👑

---

🌸 Function/Subroutine Documentation 🌸

The subroutine signature is literally this:

subroutine SSTERF (integer n, real, dimension( * ) d, real, dimension( * )
    e, integer info)

And the subroutine is SSTERF. Slay. 💅

Purpose 💡

Okay so SSTERF computes all eigenvalues of a symmetric tridiagonal matrix using the Pal-Walker-Kahan variant of the QL or QR algorithm. That’s the whole purpose, no cap. ✨

Parameters 🧚

• N — N is INTEGER. The order of the matrix. N >= 0.
• D — D is REAL 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 REAL array, dimension (N-1). On entry, the (n-1) subdiagonal elements of the tridiagonal matrix. On exit, E has been destroyed. RIP to E, honestly. 😭
• 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 🎓

The author squad is:

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

Definition at line 85 of file ssterf.f.

---

🦋 Author 🦋

Generated automatically by Doxygen for LAPACK from the source code. Bot-generated but still serving looks, fr fr. 🤖💖

---

Mwah 💋 — footer sign-off: LAPACK, Version 3.12.0, /home/abui...RC/ssterf.f(3). That’s the source/version vibe, bestie. 🫶 Bye and stay convergent! 🌈