optimise的默认是求最小值,如果要求最大,
>optimise(f,lower=0,upper=1,maximum=T)
结果是
$maximum
[1] 0.222218
$objective
[1] 0.6208067
所以xmax=0.222218 且f(xmax)=0.6208067
R软件的例子:optimize函数求给定区间[a,b]中一元函数f的最值f <- function (x, a) (x - a)^2
xmin <- optimize(f, c(0, 1), tol = 0.0001, a = 1/3)
xmin