TESTING/LIN/cgeqls.f(3)

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version 3.12.1 · 2 versions
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🎀 NAME 🎀

okay so this is TESTING/LIN/cgeqls.f — the TESTING/LIN/cgeqls.f(3) page from the Library Functions Manual, section 3. It’s literally the doc page for the cgeqls subroutine, and bestie, we are gonna get into it. 💖

✨ SYNOPSIS ✨

🌸 Functions/Subroutines 🌸

Here’s the short-and-sweet call:

       subroutine cgeqls (m, n, nrhs, a, lda, tau, b, ldb, work, lwork, info)
           CGEQLS

💖 Function/Subroutine Documentation 💖

The full signature is giving “I know exactly what I need, no notes”:

   subroutine cgeqls (integer m, integer n, integer nrhs, complex, dimension(
       lda, * ) a, integer lda, complex, dimension( * ) tau, complex,
       dimension( ldb, * ) b, integer ldb, complex, dimension( lwork ) work,
       integer lwork, integer info)
       CGEQLS

CGEQLS is the main character here, periodt. 👑

✨ Purpose ✨

!>
!> Solve the least squares problem
!>     min || A*X - B ||
!> using the QL factorization
!>     A = Q*L
!> computed by CGEQLF.
!>

🦋 Parameters 🦋

  • M — M is INTEGER. It’s the number of rows of the matrix A. M >= 0.
  • N — N is INTEGER. It’s the number of columns of the matrix A. M >= N >= 0.
  • NRHS — NRHS is INTEGER. It’s the number of columns of B. NRHS >= 0.
  • A — A is COMPLEX array, dimension (LDA,N). Details of the QL factorization of the original matrix A as returned by CGEQLF.
  • LDA — LDA is INTEGER. The leading dimension of the array A. LDA >= M.
  • TAU — TAU is COMPLEX array, dimension (N). Details of the orthogonal matrix Q.
  • B — B is COMPLEX array, dimension (LDB,NRHS). On entry, the m-by-nrhs right hand side matrix B. On exit, the n-by-nrhs solution matrix X, stored in rows m-n+1:m.
  • LDB — LDB is INTEGER. The leading dimension of the array B. LDB >= M.
  • WORK — WORK is COMPLEX array, dimension (LWORK).
  • LWORK — LWORK is INTEGER. The length of the array WORK. LWORK must be at least NRHS, and should be at least NRHS*NB, where NB is the block size for this environment.
  • 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 120 of file cgeqls.f.

🌈 Author 🌈

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🌸 ok bye bestie! This page is from LAPACK, Version 3.12.0, and the footer label is TESTING/LIN/cgeqls.f(3). Mwah 💅💖

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