DLAPMT(3)

📦 version 3.12.0, in opensuse-leap 16.0

💅 NAME 💅

okay bestie, welcome to the Library Functions Manual entry for DLAPMT(3) — yes, the one and only 💖. The source file it’s documenting is:

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

✨ SYNOPSIS ✨

🦋 Functions/Subroutines 🦋

subroutine DLAPMT (forwrd, m, n, x, ldx, k)

DLAPMT performs a forward or backward permutation of the columns of a matrix 🫶.

🫶 Function/Subroutine Documentation 🫶

subroutine DLAPMT (logical forwrd, integer m, integer n, double precision,
       dimension( ldx, * ) x, integer ldx, integer, dimension( * ) k)

🎀 Purpose 🎀

okay so here’s the tea: DLAPMT rearranges the columns of the M by N matrix X as specified by the permutation K(1),K(2),...,K(N) of the integers 1,...,N 💖.

If FORWRD = .TRUE., it’s a forward permutation:

X(*,K(J)) is moved X(*,J) for J = 1,2,...,N.

If FORWRD = .FALSE., it’s a backward permutation:

X(*,J) is moved to X(*,K(J)) for J = 1,2,...,N.

🍓 Parameters 🍓

  • FORWRD — FORWRD is LOGICAL; = .TRUE. gives a forward permutation, = .FALSE. gives a backward permutation 💅.
  • M — M is INTEGER; the number of rows of the matrix X; M >= 0.
  • N — N is INTEGER; the number of columns of the matrix X; N >= 0.
  • X — X is DOUBLE PRECISION array, dimension (LDX,N); on entry, the M by N matrix X; on exit, X contains the permuted matrix X ✨.
  • LDX — LDX is INTEGER; the leading dimension of the array X; LDX >= MAX(1,M).
  • K — K is INTEGER array, dimension (N); on entry, K contains the permutation vector. K is used as internal workspace, but reset to its original value on output 🫶.
not me lowkey stressing that K gets put back exactly how it was on output — yes bestie, it’s reset 💅 periodt.

🧚 Author 🧚

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

Definition at line 103 of file dlapmt.f.

🌈 Author 🌈

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okay that’s the whole page, bestie 🎀 — signing off from LAPACK, Version 3.12.0, with the source page living at /home/abui...RC/dlapmt.f(3) 💖✨🫶

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