Name

smax, dmax − Largest element in a real vector

FORMAT

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

Function Value

wmaxreal∗4 |  real∗8
The largest value among the elements of the real vector x.

If n<=0, wmax = 0. 

Arguments

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

xreal∗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. 

incxinteger∗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.