DSCAL(3)

SYNOPSIS
SUBROUTINE DSCAL (N, DA, DX, INCX)

NAME
dscal - Multiply a vector by a constant.

LIBRARY
SLATEC (BLAS)

CATEGORY
D1A6

TYPE
DOUBLE PRECISION (SSCAL-S, DSCAL-D, CSCAL-C)

KEYWORDS
BLAS, LINEAR ALGEBRA, SCALE, 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 scale factor DX double precision vector with N elements INCX storage spacing between elements of DX --Output-- DX double precision result (unchanged if N.LE.0) Replace double precision DX by double precision DA*DX. For I = 0 to N-1, replace DX(IX+I*INCX) with DA * DX(IX+I*INCX), where IX = 1 if INCX .GE. 0, else IX = 1+(1-N)*INCX.

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)
900821 Modified to correct problem with a negative increment. (WRB)
920501 Reformatted the REFERENCES section. (WRB)