DROTM - Online Linux Manual PageSection : 1
Updated : November 2008
Source : BLAS routine
Note : BLAS routine

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NAMEDROTM - APPLY THE MODIFIED GIVENS TRANSFORMATION, H, TO THE 2 BY N MATRIX (DX**T) , WHERE **T INDICATES TRANSPOSE

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SYNOPSISSUBROUTINE DROTM(N,DX,INCX,DY,INCY,DPARAM)    INTEGER INCX,INCY,N  DOUBLE PRECISION DPARAM(5),DX(1),DY(1)

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PURPOSE
   APPLY THE MODIFIED GIVENS TRANSFORMATION, H, TO THE 2 BY N MATRIX
   (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.

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ARGUMENTSN (input) INTEGER  number of elements in input vector(s) DX (input/output) DOUBLE PRECISION array, dimension N  double precision vector with 5 elements INCX (input) INTEGER  storage spacing between elements of DX DY (input/output) DOUBLE PRECISION array, dimension N  double precision vector with N elements INCY (input) INTEGER  storage spacing between elements of DY DPARAM (input/output) DOUBLE PRECISION array, dimension 5 DPARAM(1)=DFLAG DPARAM(2)=DH11 DPARAM(3)=DH21 DPARAM(4)=DH12 DPARAM(5)=DH22 0

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