/home/abui.../dlartgp.f(3)

Okay bestie 💖, welcome to the Library Functions Manual entry for dlartgp.f(3) — yes, we’re doing LAPACK math and we’re gonna slay it.

✨ NAME ✨

This whole page is literally the manpage for this file, bestie:

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

💅 SYNOPSIS 💅

🧚 Functions/Subroutines 🧚

• subroutine DLARTGP (f, g, cs, sn, r) — DLARTGP generates a plane rotation so that the diagonal is nonnegative. 💫

🎀 Function/Subroutine Documentation 🎀

subroutine DLARTGP (double precision f, double precision g, double precision cs, double precision sn, double precision r)

DLARTGP generates a plane rotation so that the diagonal is nonnegative. That’s the whole vibe. 🦋

🔥 Purpose 🔥

Bestie, DLARTGP generates a plane rotation so that:

   [  CS  SN  ]  .  [ F ]  =  [ R ]   where CS**2 + SN**2 = 1.
   [ -SN  CS  ]     [ G ]     [ 0 ]

This is a slower, more accurate version of the Level 1 BLAS routine DROTG, with the following other differences:

• F and G are unchanged on return.
• If G=0, then CS=(+/-)1 and SN=0.
• If F=0 and (G .ne. 0), then CS=0 and SN=(+/-)1.

The sign is chosen so that R >= 0. Periodt. 👑

🍓 Parameters 🍓

• F — F is DOUBLE PRECISION; the first component of vector to be rotated. 💅
• G — G is DOUBLE PRECISION; the second component of vector to be rotated. 💅
• CS — CS is DOUBLE PRECISION; the cosine of the rotation. 💅
• SN — SN is DOUBLE PRECISION; the sine of the rotation. 💅
• R — R is DOUBLE PRECISION; the nonzero component of the rotated vector. 💅

This version has a few statements commented out for thread safety (machine parameters are computed on each entry). 10 feb 03, SJH.

👑 Author 👑

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

🧚 Definition at line 94 of file dlartgp.f. 🧚

💜 Author 💜

Generated automatically by Doxygen for LAPACK from the source code.

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