/home/abui...RC/ssbev.f(3)

💅 /home/abui...RC/ssbev.f(3) — Library Functions Manual 💅

okay so this page is for /home/abui...RC/ssbev.f(3), and the manual name is Library Functions Manual. The actual file path in the NAME section is /home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/SRC/ssbev.f, bestie. It's giving LAPACK 3.12.0 and main character energy. 💖

✨ NAME ✨

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

💖 SYNOPSIS 💖

🌸 Functions/Subroutines 🌸

subroutine SSBEV (jobz, uplo, n, kd, ab, ldab, w, z, ldz, work, info)

SSBEV computes the eigenvalues and, optionally, the left and/or right eigenvectors for OTHER matrices.

🦋 Function/Subroutine Documentation 🦋

   subroutine SSBEV (character jobz, character uplo, integer n, integer kd,
       real, dimension( ldab, * ) ab, integer ldab, real, dimension( * ) w,
       real, dimension( ldz, * ) z, integer ldz, real, dimension( * ) work,
       integer info)

SSBEV computes the eigenvalues and, optionally, the left and/or right eigenvectors for OTHER matrices.

🎀 Purpose 🎀

Okay so the purpose is exactly this: SSBEV computes all the eigenvalues and, optionally, eigenvectors of a real symmetric band matrix A. Slay. ✨

🧚 Parameters 🧚

• JOBZ — JOBZ is CHARACTER*1. Pick your vibe:
  • = 'N': Compute eigenvalues only;
  • = 'V': Compute eigenvalues and eigenvectors.
• UPLO — UPLO is CHARACTER*1. Which triangle are we storing? 👀
  • = 'U': Upper triangle of A is stored;
  • = 'L': Lower triangle of A is stored.
• N — N is INTEGER. The order of the matrix A. N >= 0.
• KD — KD is INTEGER. The number of superdiagonals of the matrix A if UPLO = 'U', or the number of subdiagonals if UPLO = 'L'. KD >= 0.
• AB — AB is REAL array, dimension (LDAB, N). On entry, this is the upper or lower triangle of the symmetric band matrix A, stored in the first KD+1 rows of the array. The j-th column of A is stored in the j-th column of the array AB as follows:

if UPLO = 'U', AB(kd+1+i-j,j) = A(i,j) for max(1,j-kd)<=i<=j;
if UPLO = 'L', AB(1+i-j,j)    = A(i,j) for j<=i<=min(n,j+kd).

On exit, AB is overwritten by values generated during the reduction to tridiagonal form. If UPLO = 'U', the first superdiagonal and the diagonal of the tridiagonal matrix T are returned in rows KD and KD+1 of AB, and if UPLO = 'L', the diagonal and first subdiagonal of T are returned in the first two rows of AB. 🌀

• LDAB — LDAB is INTEGER. The leading dimension of the array AB. LDAB >= KD + 1.
• W — W is REAL array, dimension (N). If INFO = 0, the eigenvalues in ascending order.
• Z — Z is REAL array, dimension (LDZ, N). If JOBZ = 'V', then if INFO = 0, Z contains the orthonormal eigenvectors of the matrix A, with the i-th column of Z holding the eigenvector associated with W(i). If JOBZ = 'N', then Z is not referenced. 💅
• LDZ — LDZ is INTEGER. The leading dimension of the array Z. LDZ >= 1, and if JOBZ = 'V', LDZ >= max(1,N).
• WORK — WORK is REAL array, dimension (max(1,3*N-2))
• INFO — INFO is INTEGER. Exit tea:
  • = 0: successful exit
  • < 0: if INFO = -i, the i-th argument had an illegal value
  • > 0: if INFO = i, the algorithm failed to converge; i off-diagonal elements of an intermediate tridiagonal form did not converge to zero.

🌟 Author 🌟

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

Definition at line 144 of file ssbev.f.

🌟 Author 🌟

Generated automatically by Doxygen for LAPACK from the source code.

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okay that's the whole page, bestie. The footer vibe is LAPACK Version 3.12.0 and /home/abui...RC/ssbev.f(3) — no separate date line in the footer, so we're not making one up. Mwah 💋🎀