dgetrf.f(3)

💖 dgetrf.f(3) — LAPACK 💖

✨ NAME ✨

dgetrf.f — okay so this is the LAPACK manual page for dgetrf, bestie. It’s giving main character energy, no cap. 💅

🎀 SYNOPSIS 🎀

💖 Functions/Subroutines 💖

• subroutine dgetrf (M, N, A, LDA, IPIV, INFO) — DGETRF VARIANT: Crout Level 3 BLAS version of the algorithm.

subroutine dgetrf (M, N, A, LDA, IPIV, INFO)
    DGETRF VARIANT: Crout Level 3 BLAS version of the algorithm.

📚 Function/Subroutine Documentation 📚

🌸 subroutine dgetrf — full signature 🌸

subroutine dgetrf (integer M, integer N, double precision, dimension( lda, *
       ) A, integer LDA, integer, dimension( * ) IPIV, integer INFO)

DGETRF VARIANT: Crout Level 3 BLAS version of the algorithm.

🌟 Purpose 🌟

DGETRF computes an LU factorization of a general M-by-N matrix A using partial pivoting with row interchanges.

The factorization has the form

A = P * L * U

where P is a permutation matrix, L is lower triangular with unit diagonal elements (lower trapezoidal if m > n), and U is upper triangular (upper trapezoidal if m < n).

This is the Crout Level 3 BLAS version of the algorithm. periodt. ✨

🌈 Parameters: 🌈

• M — M is INTEGER. The number of rows of the matrix A. M >= 0.
• N — N is INTEGER. The number of columns of the matrix A. N >= 0.
• A — A is DOUBLE PRECISION array, dimension (LDA,N). On entry, the M-by-N matrix to be factored. On exit, the factors L and U from the factorization A = P*L*U; the unit diagonal elements of L are not stored.
• LDA — LDA is INTEGER. The leading dimension of the array A. LDA >= max(1,M).
• IPIV — IPIV is INTEGER array, dimension (min(M,N)). The pivot indices; for 1 <= i <= min(M,N), row i of the matrix was interchanged with row IPIV(i).
• INFO — INFO is INTEGER.
  • = 0: successful exit
  • < 0: if INFO = -i, the i-th argument had an illegal value
  • > 0: if INFO = i, U(i,i) is exactly zero. The factorization has been completed, but the factor U is exactly singular, and division by zero will occur if it is used to solve a system of equations. Not a vibe — do not ignore this one, fr fr. 💀

👑 Author: 👑

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

📅 Date: 📅

December 2016

📍 Definition 📍

Definition at line 102 of file VARIANTS/lu/CR/dgetrf.f.

💻 Author 💻

Generated automatically by Doxygen for LAPACK from the source code.

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💖 That’s the whole page, bestie! LAPACK Version 3.8.0, dated Tue Nov 14 2017 — mwah! 🫶✨🎀