slartgp.f(3)

NAME
slartgp.f

SYNOPSIS

  Functions/Subroutines
subroutine slartgp (F, G, CS, SN, R)
SLARTGP generates a plane rotation so that the diagonal is nonnegative.

Function/Subroutine Documentation

  subroutine slartgp (real F, real G, real CS, real SN, real R)

SLARTGP generates a plane rotation so that the diagonal is nonnegative.

Purpose:

     SLARTGP 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 SROTG,
     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.

Parameters:
    F

              F is REAL
              The first component of vector to be rotated.

    G

              G is REAL
              The second component of vector to be rotated.

    CS

              CS is REAL
              The cosine of the rotation.

    SN

              SN is REAL
              The sine of the rotation.

    R

              R is REAL
              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.

Date:
    December 2016

Definition at line 97 of file slartgp.f.

Author

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