SROTM(3)

💖 NAME 💖

Welcome to srotm.f(3), bestie! This is the Library Functions Manual page for srotm.f, and the source path is exactly:

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

It’s giving iconic Fortran/BLAS source-file energy, no cap. 💅

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✨ SYNOPSIS ✨

Functions/Subroutines

subroutine SROTM (n, sx, incx, sy, incy, sparam)

SROTM

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🎀 Function/Subroutine Documentation 🎀

subroutine SROTM (integer n, real, dimension(*) sx, integer incx, real, dimension(*) sy, integer incy, real, dimension(5) sparam)

SROTM

Purpose

Okay so the mission, bestie, is to apply the modified Givens transformation H to the 2 by N matrix

(SX**T)

where **T indicates transpose. The elements of SX are in (SX**T) and they sit at SX(LX+I*INCX), for I = 0 TO N-1, where LX = 1 IF INCX .GE. 0, ELSE LX = (-INCX)*N, and similarly for SY using USING LY and INCY — yes, the source literally says USING USING, and we respect the typo. 🫶

With SPARAM(1)=SFLAG, H has one of these forms..

SFLAG=-1.E0     SFLAG=0.E0        SFLAG=1.E0     SFLAG=-2.E0

  (SH11  SH12)    (1.E0  SH12)    (SH11  1.E0)    (1.E0  0.E0)
H=(          )    (          )    (          )    (          )
  (SH21  SH22),   (SH21  1.E0),   (-1.E0 SH22),   (0.E0  1.E0).

For the data-storage tea in SPARAM, see SROTMG. 👑

Parameters

• N — N is INTEGER; number of elements in input vector(s). 🌸
• SX — SX is REAL array, dimension ( 1 + ( N - 1 )*abs( INCX ) ).
• INCX — INCX is INTEGER; storage spacing between elements of SX.
• SY — SY is REAL array, dimension ( 1 + ( N - 1 )*abs( INCY ) ).
• INCY — INCY is INTEGER; storage spacing between elements of SY.
• SPARAM — SPARAM is REAL array, dimension (5).
  • SPARAM(1)=SFLAG
  • SPARAM(2)=SH11
  • SPARAM(3)=SH21
  • SPARAM(4)=SH12
  • SPARAM(5)=SH22

Author

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

Definition at line 96 of file srotm.f.

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🌸 Author 🌸

Generated automatically by Doxygen for LAPACK from the source code.

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Alright bestie, that’s the whole srotm.f(3) situation. The cute little footer says source LAPACK, Version 3.12.0, and /home/abui...SRC/srotm.f(3) — mwah 💅✨