drotm (3) - Linux Manuals
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)
DXDX is DOUBLE PRECISION array, dimension N double precision vector with N elements
INCXINCX is INTEGER storage spacing between elements of DX
DYDY is DOUBLE PRECISION array, dimension N double precision vector with N elements
INCYINCY is INTEGER storage spacing between elements of DY
DPARAMDPARAM 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
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