SDOT(3)

SYNOPSIS
REAL FUNCTION SDOT (N, SX, INCX, SY, INCY)

NAME
sdot - Compute the inner product of two vectors.

LIBRARY
SLATEC (BLAS)

CATEGORY
D1A4

TYPE
SINGLE PRECISION (SDOT-S, DDOT-D, CDOTU-C)

KEYWORDS
BLAS, 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) 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-- SDOT single precision dot product (zero if N .LE. 0) Returns the dot product of single precision SX and SY. SDOT = sum for I = 0 to N-1 of SX(LX+I*INCX) * 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)