CAXPY(3)

SYNOPSIS
SUBROUTINE CAXPY (N, CA, CX, INCX, CY, INCY)

NAME
caxpy - Compute a constant times a vector plus a vector.

LIBRARY
SLATEC (BLAS)

CATEGORY
D1A7

TYPE
COMPLEX (SAXPY-S, DAXPY-D, CAXPY-C)

KEYWORDS
BLAS, LINEAR ALGEBRA, TRIAD, 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) CA complex scalar multiplier CX complex vector with N elements INCX storage spacing between elements of CX CY complex vector with N elements INCY storage spacing between elements of CY --Output-- CY complex result (unchanged if N .LE. 0) Overwrite complex CY with complex CA*CX + CY. For I = 0 to N-1, replace CY(LY+I*INCY) with CA*CX(LX+I*INCX) + CY(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
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)
920801 Removed variable CANORM. (RWC, WRB)