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  4. clacrt.f(3)

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clacrt.f(3) LAPACK clacrt.f(3)

NAME

clacrt.f

SYNOPSIS

Functions/Subroutines


subroutine clacrt (N, CX, INCX, CY, INCY, C, S)
CLACRT performs a linear transformation of a pair of complex vectors.

Function/Subroutine Documentation

subroutine clacrt (integer N, complex, dimension( * ) CX, integer INCX, complex, dimension( * ) CY, integer INCY, complex C, complex S)

CLACRT performs a linear transformation of a pair of complex vectors.

Purpose: 



 CLACRT performs the operation


    (  c  s )( x )  ==> ( x )


    ( -s  c )( y )      ( y )


 where c and s are complex and the vectors x and y 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 CX.  INCX <> 0.

CY



          CY is COMPLEX array, dimension (N)


          On input, the vector y.


          On output, CY is overwritten with -s*x + c*y.

INCY



          INCY is INTEGER


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

C



          C is COMPLEX

S



          S is COMPLEX


          C and S define the matrix


             [  C   S  ].


             [ -S   C  ]

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

December 2016

Definition at line 107 of file clacrt.f.

Author

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