2. EL 7
  3. lapack
  4. CROT(3)

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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