drotm.f(3) LAPACK drotm.f(3)
NAME
drotm.f -
SYNOPSIS
Functions/Subroutines
subroutine drotm (N, DX, INCX, DY, INCY, DPARAM)
DROTM
Function/Subroutine Documentation
subroutine drotm (integerN, double precision, dimension(*)DX, integerINCX, double precision, dimension(*)DY, integerINCY, double precision,
dimension(5)DPARAM)
DROTM Purpose:
APPLY THE MODIFIED GIVENS TRANSFORMATION, H, TO THE 2 BY N MATRIX
(DX**T) , WHERE **T INDICATES TRANSPOSE. THE ELEMENTS OF DX ARE IN
(DY**T)
DX(LX+I*INCX), I = 0 TO N-1, WHERE LX = 1 IF INCX .GE. 0, ELSE
LX = (-INCX)*N, AND SIMILARLY FOR SY USING LY AND INCY.
WITH DPARAM(1)=DFLAG, H HAS ONE OF THE FOLLOWING FORMS..
DFLAG=-1.D0 DFLAG=0.D0 DFLAG=1.D0 DFLAG=-2.D0
(DH11 DH12) (1.D0 DH12) (DH11 1.D0) (1.D0 0.D0)
H=( ) ( ) ( ) ( )
(DH21 DH22), (DH21 1.D0), (-1.D0 DH22), (0.D0 1.D0).
SEE DROTMG FOR A DESCRIPTION OF DATA STORAGE IN DPARAM.
Parameters:
N
N is INTEGER
number of elements in input vector(s)
DX
DX is DOUBLE PRECISION array, dimension N
double precision vector with N elements
INCX
INCX is INTEGER
storage spacing between elements of DX
DY
DY is DOUBLE PRECISION array, dimension N
double precision vector with N elements
INCY
INCY is INTEGER
storage spacing between elements of DY
DPARAM
DPARAM is DOUBLE PRECISION array, dimension 5
DPARAM(1)=DFLAG
DPARAM(2)=DH11
DPARAM(3)=DH21
DPARAM(4)=DH12
DPARAM(5)=DH22
Author:
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
November 2011
Definition at line 99 of file drotm.f.
Author
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.4.2 Tue Sep 25 2012 drotm.f(3)
