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crot.f(3) LAPACK crot.f(3)

NAME

crot.f -

SYNOPSIS

Functions/Subroutines


subroutine crot (N, CX, INCX, CY, INCY, C, S)
CROT applies a plane rotation with real cosine and complex sine to a pair of complex vectors.

Function/Subroutine Documentation

subroutine crot (integerN, complex, dimension( * )CX, integerINCX, complex, dimension( * )CY, integerINCY, realC, complexS)

CROT applies a plane rotation with real cosine and complex sine to a pair of complex vectors.

Purpose:


CROT applies a plane rotation, where the cos (C) is real and the
sin (S) is complex, and the vectors CX and CY are complex.

Parameters:

N


N is INTEGER
The number of elements in the vectors CX and CY.

CX


CX is COMPLEX array, dimension (N)
On input, the vector X.
On output, CX is overwritten with C*X + S*Y.

INCX


INCX is INTEGER
The increment between successive values of CY. INCX <> 0.

CY


CY is COMPLEX array, dimension (N)
On input, the vector Y.
On output, CY is overwritten with -CONJG(S)*X + C*Y.

INCY


INCY is INTEGER
The increment between successive values of CY. INCX <> 0.

C


C is REAL

S


S is COMPLEX
C and S define a rotation
[ C S ]
[ -conjg(S) C ]
where C*C + S*CONJG(S) = 1.0.

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

September 2012

Definition at line 104 of file crot.f.

Author

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Tue Sep 25 2012 Version 3.4.2