Note: this is a BLAS routine and is not in libslatec.a
*DECK SROT
SUBROUTINE SROT (N, SX, INCX, SY, INCY, SC, SS)
C***BEGIN PROLOGUE SROT
C***PURPOSE Apply a plane Givens rotation.
C***LIBRARY SLATEC (BLAS)
C***CATEGORY D1A8
C***TYPE SINGLE PRECISION (SROT-S, DROT-D, CSROT-C)
C***KEYWORDS BLAS, GIVENS ROTATION, GIVENS TRANSFORMATION,
C LINEAR ALGEBRA, PLANE 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***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 SC element of rotation matrix
C SS element of rotation matrix
C
C --Output--
C SX rotated vector SX (unchanged if N .LE. 0)
C SY rotated vector SY (unchanged if N .LE. 0)
C
C Multiply the 2 x 2 matrix ( SC SS) times the 2 x N matrix (SX**T)
C (-SS SC) (SY**T)
C where **T indicates transpose. The elements of SX are in
C SX(LX+I*INCX), I = 0 to N-1, where LX = 1 if INCX .GE. 0, else
C LX = 1+(1-N)*INCX, and similarly for SY using LY and INCY.
C
C***REFERENCES C. L. Lawson, R. J. Hanson, D. R. Kincaid and F. T.
C Krogh, Basic linear algebra subprograms for Fortran
C usage, Algorithm No. 539, Transactions on Mathematical
C Software 5, 3 (September 1979), pp. 308-323.
C***ROUTINES CALLED (NONE)
C***REVISION HISTORY (YYMMDD)
C 791001 DATE WRITTEN
C 861211 REVISION DATE from Version 3.2
C 891214 Prologue converted to Version 4.0 format. (BAB)
C 920310 Corrected definition of LX in DESCRIPTION. (WRB)
C 920501 Reformatted the REFERENCES section. (WRB)
C***END PROLOGUE SROT