DRSCL  -  multiplie an n-element real vector x by the real
       scalar 1/a


SYNOPSIS

       SUBROUTINE DRSCL( N, SA, SX, INCX )

           INTEGER       INCX, N

           DOUBLE        PRECISION SA

           DOUBLE        PRECISION SX( * )


PURPOSE

       DRSCL multiplies an n-element real vector x  by  the  real
       scalar  1/a. This is done without overflow or underflow as
       long as
       the final result x/a does not overflow or underflow.


ARGUMENTS

       N       (input) INTEGER
               The number of components of the vector x.

       SA      (input) DOUBLE PRECISION
               The scalar a which is used to divide  each  compo­
               nent  of  x.   SA  must be >= 0, or the subroutine
               will divide by zero.

       SX      (input/output) DOUBLE PRECISION array, dimension
               (1+(N-1)*abs(INCX)) The n-element vector x.

       INCX    (input) INTEGER
               The increment between  successive  values  of  the
               vector    SX.     >   0:    SX(1)   =   X(1)   and
               SX(1+(i-1)*INCX) = x(i),     1< i<= n


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