options(scipen=999)
fff=function(x)588 * x * 1000000 - 5000
>uniroot(fff, lower=0.0000000000001, upper=1, extendInt = "yes",maxiter = 1000000000)$root
[1] 0.0000000000001
> fff(0.0000085)
[1] -2
> fff(0.0000086)
[1] 56.8
fff()
的正确值介于 0.0000085
和 0.0000086
之间,但为什么 uniroot 返回我 0.0000000000001
??