 
      SUBROUTINE SROTM(N,SX,INCX,SY,INCY,SPARAM)
C***BEGIN PROLOGUE  SROTM
C***DATE WRITTEN   791001   (YYMMDD)
C***REVISION DATE  820801   (YYMMDD)
C***CATEGORY NO.  D1A8
C***KEYWORDS  BLAS,LINEAR ALGEBRA,MODIFIED GIVENS ROTATION,VECTOR
C***AUTHOR  LAWSON, C. L., (JPL)
C           HANSON, R. J., (SNLA)
C           KINCAID, D. R., (U. OF TEXAS)
C           KROGH, F. T., (JPL)
C***PURPOSE  Apply s.p. modified Givens transformation
C***DESCRIPTION
C
C                B L A S  Subprogram
C    Description of Parameters
C
C     --Input--
C        N  number of elements in input vector(s)
C       SX  single precision vector with N elements
C     INCX  storage spacing between elements of SX
C       SY  single precision vector with N elements
C     INCY  storage spacing between elements of SY
C   SPARAM  5-element vector. SPARAM(1) is SFLAG described below.
C             Locations 2-5 of SPARAM contain elements of the
C              transformation matrix H described below.
C
C     --Output--
C       SX  rotated vector (unchanged if N .LE. 0)
C       SY  rotated vector (unchanged if N .LE. 0)
C
C     Apply the modified Givens transformation, H, to the 2 by N matrix
C
C     (SX**T) , where **T indicates transpose.  The elements of SX are
C     in (SY**T)
C
C     SX(LX+I*INCX), I = 0 to N-1, where LX = 1 if INCX .GE. 0, else
C     LX = (-INCX)*N, and similarly for SY using using LY and INCY.
C     With SPARAM(1)=SFLAG, H has one of the following forms..
C
C     SFLAG=-1.E0     SFLAG=0.E0        SFLAG=1.E0     SFLAG=-2.E0
C
C       (SH11  SH12)    (1.E0  SH12)    (SH11  1.E0)    (1.E0  0.E0)
C     H=(          )    (          )    (          )    (          )
C       (SH21  SH22),   (SH21  1.E0),   (-1.E0 SH22),   (0.E0  1.E0).
C
C     See SROTMG for a description of data storage in SPARAM.
C***REFERENCES  LAWSON C.L., HANSON R.J., KINCAID D.R., KROGH F.T.,
C                 *BASIC LINEAR ALGEBRA SUBPROGRAMS FOR FORTRAN USAGE*,
C                 ALGORITHM NO. 539, TRANSACTIONS ON MATHEMATICAL
C                 SOFTWARE, VOLUME 5, NUMBER 3, SEPTEMBER 1979, 308-323
C***ROUTINES CALLED  (NONE)
C***END PROLOGUE  SROTM
 
 
