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MAN page from openSUSE Leap 15 blas-man-3.5.0-lp150.20.1.noarch.rpm

crotg.f

Section: LAPACK (3)
Updated: Thu Mar 29 2018
Index 

NAME

crotg.f 

SYNOPSIS


 

Functions/Subroutines


subroutine CROTG (CA, CB, C, S)
CROTG  

Function/Subroutine Documentation

 

subroutine CROTG (complex CA, complex CB, real C, complex S)

CROTG

Purpose:

 CROTG determines a complex Givens rotation.


 

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

November 2011

Definition at line 41 of file crotg.f.

41 *42 *  -- Reference BLAS level1 routine (version 3.4.0) --43 *  -- Reference BLAS is a software package provided by Univ. of Tennessee,    --44 *  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--45 *     November 201146 *47 *     .. Scalar Arguments ..48       COMPLEX CA,CB,S49       REAL C50 *     ..51 *52 *  =====================================================================53 *54 *     .. Local Scalars ..55       COMPLEX ALPHA56       REAL NORM,SCALE57 *     ..58 *     .. Intrinsic Functions ..59       INTRINSIC cabs,conjg,sqrt60 *     ..61       IF (cabs(ca).EQ.0.) THEN62          c = 0.63          s = (1.,0.)64          ca = cb65       ELSE66          scale = cabs(ca) + cabs(cb)67          norm = scale*sqrt((cabs(ca/scale))**2+ (cabs(cb/scale))**2)68          alpha = ca/cabs(ca)69          c = cabs(ca)/norm70          s = alpha*conjg(cb)/norm71          ca = alpha*norm72       END IF73       RETURN
 

Author

Generated automatically by Doxygen for LAPACK from the source code.


 

Index

NAME
SYNOPSIS
Functions/Subroutines
Function/Subroutine Documentation
subroutine CROTG (complex CA, complex CB, real C, complex S)
Author

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