DAXPY Class

***PURPOSE Compute a constant times a vector plus a vector. ***CATEGORY D1A7 ***TYPE DOUBLE PRECISION (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) DA double precision scalar multiplier DX double precision vector with N elements INCX storage spacing between elements of DX DY double precision vector with N elements INCY storage spacing between elements of DY --Output-- DY double precision result (unchanged if N .LE. 0) Overwrite double precision DY with double precision DA*DX + DY. For I = 0 to N-1, replace DY(LY+I*INCY) with DA*DX(LX+I*INCX) + DY(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) ***END PROLOGUE DAXPY ***FIRST EXECUTABLE STATEMENT DAXPY

public class DAXPY

Public Class DAXPY