SSWAP(3)

SYNOPSIS
SUBROUTINE SSWAP (N, SX, INCX, SY, INCY)

NAME
sswap - Interchange two vectors.

LIBRARY
SLATEC (BLAS)

CATEGORY
D1A5

TYPE
SINGLE PRECISION (SSWAP-S, DSWAP-D, CSWAP-C, ISWAP-I)

KEYWORDS
BLAS, INTERCHANGE, LINEAR ALGEBRA, VECTOR

AUTHOR
Lawson, C. L., (JPL) Hanson, R. J., (SNLA) Kincaid, D. R., (U. of Texas) Krogh, F. T., (JPL)

DESCRIPTION
B L A S Subprogram Description of Parameters --Input-- N number of elements in input vector(s) SX single precision vector with N elements INCX storage spacing between elements of SX SY single precision vector with N elements INCY storage spacing between elements of SY --Output-- SX input vector SY (unchanged if N .LE. 0) SY input vector SX (unchanged if N .LE. 0) Interchange single precision SX and single precision SY. For I = 0 to N-1, interchange SX(LX+I*INCX) and SY(LY+I*INCY), where LX = 1 if INCX .GE. 0, else LX = 1+(1-N)*INCX, and LY is defined in a similar way using INCY.

REFERENCES
C. L. Lawson, R. J. Hanson, D. R. Kincaid and F. T. Krogh, Basic linear algebra subprograms for Fortran usage, Algorithm No. 539, Transactions on Mathematical Software 5, 3 (September 1979), pp. 308-323.

ROUTINES CALLED
(NONE)

REVISION HISTORY (YYMMDD)
791001 DATE WRITTEN
890831 Modified array declarations. (WRB)
890831 REVISION DATE from Version 3.2
891214 Prologue converted to Version 4.0 format. (BAB)
920310 Corrected definition of LX in DESCRIPTION. (WRB)
920501 Reformatted the REFERENCES section. (WRB)