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crotg.f

Section: LAPACK (3)
Updated: Fri Nov 4 2016
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

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Index

NAME

SYNOPSIS

Functions/Subroutines

Function/Subroutine Documentation

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

Author

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