ISWAP(3)

SYNOPSIS
SUBROUTINE ISWAP (N, IX, INCX, IY, INCY)

NAME
iswap - Interchange two vectors.

LIBRARY
SLATEC (BLAS)

CATEGORY
D1A5

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

KEYWORDS
BLAS, INTERCHANGE, LINEAR ALGEBRA, VECTOR

AUTHOR
Vandevender, W. H., (SNLA)

DESCRIPTION
Extended B L A S Subprogram Description of Parameters --Input-- N number of elements in input vector(s) IX integer vector with N elements INCX storage spacing between elements of IX IY integer vector with N elements INCY storage spacing between elements of IY --Output-- IX input vector IY (unchanged if N .LE. 0) IY input vector IX (unchanged if N .LE. 0) Interchange integer IX and integer IY. For I = 0 to N-1, interchange IX(LX+I*INCX) and IY(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)
850601 DATE WRITTEN
861211 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)