smax, dmax 

Largest element in a real vector

FORMAT

  {S,D}MAX (n, x, incx)

Function Value

  wmax                real*4 |  real*8
                      The largest value among the elements of the real vector
                      x.

                      If n<=0, wmax = 0.

Arguments

  n                   integer*4
                      On entry, the number of elements in real vector x.
                      On exit, n is unchanged.

  x                   real*4 |  real*8
                      On entry, a one-dimensional array X of length at least
                      (1+(n-1)*|incx|), containing the elements of real
                      vector x.
                      On exit, x is unchanged.

  incx                integer*4
                      On entry, the increment for the array X.
                      If incx > 0, vector x is stored forward in the array,
                      so that x(i) is stored in location X(1+(i-1)*incx).
                      If incx < 0, vector x is stored backward in the array,
                      so that x(i) is stored in location X(1+(n-i)*|incx|).
                      If incx = 0, only the first element is accessed.
                      On exit, incx is unchanged.

Description

  SMAX and DMAX are functions that determine the largest value among the real
  elements of a vector x: MAX{x(j), j = 1,2, ..., n}
  If incx < 0, the result is identical to using |incx|.  If incx = 0, the
  computation is a time-consuming way of setting wmax = x(1).

Example

  INTEGER*4 N, INCX
  REAL*4 X(40), WMAX
  INCX = 2
  N = 20
  WMAX = SMAX(N,X,INCX)

  This FORTRAN example shows how to compute the largest value of the elements
  of a vector x.