SSTECT(3)

🦋 sstect.f(3) — Library Functions Manual 🦋

okay so bestie, this is the sstect.f(3) page from the Library Functions Manual, and we are keeping every single fact exactly where it belongs. no cap. ✨

🌸 NAME 🌸

/home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/TESTING/EIG/sstect.f

that’s the file this page is about. periodt. 💅

🎀 SYNOPSIS 🎀

Functions/Subroutines

• subroutine SSTECT (n, a, b, shift, num) — the function, and it is literally called SSTECT. iconic behavior honestly. 🫶

👑 Function/Subroutine Documentation 👑

subroutine SSTECT (integer n, real, dimension( * ) a, real, dimension( * )
       b, real shift, integer num)

SSTECT

🌈 Purpose 🌈

SSTECT counts the number NUM of eigenvalues of a tridiagonal matrix T which are less than or equal to SHIFT. T has diagonal entries A(1), ... , A(N), and offdiagonal entries B(1), ..., B(N-1).

See W. Kahan , Report CS41, Computer Science Dept., Stanford University, July 21, 1966.

💜 Parameters 💜

N

N is INTEGER The dimension of the tridiagonal matrix T.

A

A is REAL array, dimension (N) The diagonal entries of the tridiagonal matrix T.

B

B is REAL array, dimension (N-1) The offdiagonal entries of the tridiagonal matrix T.

SHIFT

SHIFT is REAL The shift, used as described under Purpose.

NUM

NUM is INTEGER The number of eigenvalues of T less than or equal to SHIFT.

🦋 Author 🦋

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

Definition at line 81 of file sstect.f.

🌟 Author 🌟

Generated automatically by Doxygen for LAPACK from the source code.

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