CDCDOT(3)

SYNOPSIS
COMPLEX FUNCTION CDCDOT (N, CB, CX, INCX, CY, INCY)

NAME
cdcdot - Compute the inner product of two vectors with extended precision accumulation.

LIBRARY
SLATEC (BLAS)

CATEGORY
D1A4

TYPE
COMPLEX (SDSDOT-S, CDCDOT-C)

KEYWORDS
BLAS, DOT PRODUCT, INNER PRODUCT, 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) CB complex scalar to be added to inner product 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-- CDCDOT complex dot product (CB if N .LE. 0) Returns complex result with dot product accumulated in D.P. CDCDOT = CB + sum for I = 0 to N-1 of CX(LX+I*INCY)*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
890531 Changed all specific intrinsics to generic. (WRB)
890531 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)