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

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

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SYNOPSISSUBROUTINE SROTM(N,SX,INCX,SY,INCY,SPARAM)    INTEGER INCX,INCY,N  REAL SPARAM(5),SX(1),SY(1)

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PURPOSE
   APPLY THE MODIFIED GIVENS TRANSFORMATION, H, TO THE 2 BY N MATRIX
   (DX**T)

   SX(LX+I*INCX), I = 0 TO N-1, WHERE LX = 1 IF INCX .GE. 0, ELSE
   LX = (-INCX)*N, AND SIMILARLY FOR SY USING USING LY AND INCY.
   WITH SPARAM(1)=SFLAG, H HAS ONE OF THE FOLLOWING FORMS..
   SFLAG=-1.E0 SFLAG=0.E0 SFLAG=1.E0 SFLAG=-2.E0
     (SH11 SH12) (1.E0 SH12) (SH11 1.E0) (1.E0 0.E0)
   H=( ) ( ) ( ) ( )
     (SH21 SH22), (SH21 1.E0), (-1.E0 SH22), (0.E0 1.E0).
   SEE SROTMG FOR A DESCRIPTION OF DATA STORAGE IN SPARAM.

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ARGUMENTSN (input) INTEGER  number of elements in input vector(s) SX (input/output) REAL array, dimension N  double precision vector with 5 elements INCX (input) INTEGER  storage spacing between elements of SX SY (input/output) REAL array, dimension N  double precision vector with N elements INCY (input) INTEGER  storage spacing between elements of SY SPARAM (input/output) REAL array, dimension 5 SPARAM(1)=SFLAG SPARAM(2)=SH11 SPARAM(3)=SH21 SPARAM(4)=SH12 SPARAM(5)=SH22 0

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