Source module last modified on Thu, 2 Jul 1998, 23:17;
HTML image of Fortran source automatically generated by for2html on Sun, 23 Jun 2002, 15:10.

      SUBROUTINE SROTM (N,SX,INCX,SY,INCY,SPARAM)
#
#     APPLY THE MODIFIED GIVENS TRANSFORMATION, H, TO THE 2 BY N MATRIX
#
#     (SX**T) , WHERE **T INDICATES TRANSPOSE. THE ELEMENTS OF SX ARE IN
#     (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.
#
      DIMENSION SX(1),SY(1),SPARAM(5)
      DATA ZERO,TWO/0.E0,2.E0/
#
      SFLAG=SPARAM(1)
      IF(N <= 0 ||(SFLAG+TWO==ZERO)) GO TO 140
          IF(! (INCX==INCY&& INCX >0)) GO TO 70
#
               NSTEPS=N*INCX
               IF(SFLAG) 50,10,30
   10          CONTINUE
               SH12=SPARAM(4)
               SH21=SPARAM(3)
                    DO 20 I=1,NSTEPS,INCX
                    W=SX(I)
                    Z=SY(I)
                    SX(I)=W+Z*SH12
                    SY(I)=W*SH21+Z
   20               CONTINUE
               GO TO 140
   30          CONTINUE
               SH11=SPARAM(2)
               SH22=SPARAM(5)
                    DO 40 I=1,NSTEPS,INCX
                    W=SX(I)
                    Z=SY(I)
                    SX(I)=W*SH11+Z
                    SY(I)=-W+SH22*Z
   40               CONTINUE
               GO TO 140
   50          CONTINUE
               SH11=SPARAM(2)
               SH12=SPARAM(4)
               SH21=SPARAM(3)
               SH22=SPARAM(5)
                    DO 60 I=1,NSTEPS,INCX
                    W=SX(I)
                    Z=SY(I)
                    SX(I)=W*SH11+Z*SH12
                    SY(I)=W*SH21+Z*SH22
   60               CONTINUE
               GO TO 140
   70     CONTINUE
          KX=1
          KY=1
          IF(INCX < 0) KX=1+(1-N)*INCX
          IF(INCY < 0) KY=1+(1-N)*INCY
#
          IF(SFLAG)120,80,100
   80     CONTINUE
          SH12=SPARAM(4)
          SH21=SPARAM(3)
               DO 90 I=1,N
               W=SX(KX)
               Z=SY(KY)
               SX(KX)=W+Z*SH12
               SY(KY)=W*SH21+Z
               KX=KX+INCX
               KY=KY+INCY
   90          CONTINUE
          GO TO 140
  100     CONTINUE
          SH11=SPARAM(2)
          SH22=SPARAM(5)
               DO 110 I=1,N
               W=SX(KX)
               Z=SY(KY)
               SX(KX)=W*SH11+Z
               SY(KY)=-W+SH22*Z
               KX=KX+INCX
               KY=KY+INCY
  110          CONTINUE
          GO TO 140
  120     CONTINUE
          SH11=SPARAM(2)
          SH12=SPARAM(4)
          SH21=SPARAM(3)
          SH22=SPARAM(5)
               DO 130 I=1,N
               W=SX(KX)
               Z=SY(KY)
               SX(KX)=W*SH11+Z*SH12
               SY(KY)=W*SH21+Z*SH22
               KX=KX+INCX
               KY=KY+INCY
  130          CONTINUE
  140     CONTINUE
          RETURN
          END