For循环中，和手动一个个算，结果不一样

江夏雁

896

收藏 2020-06-28

悬赏 10 个论坛币已解决

dd2<-c(0.50,0.58,0.16,0.52,0.53,0.54,0.46,0.59)

m<-c()

for(i in 8){
  c<-dd2[-i]
  m<-fitdist(c, distr="beta", method = "mle",start=NULL,fix.arg=NULL)$estimate[1]
}
运行结果为
> m[1]    NA    NA    NA    NA    NA    NA    NA 5.456822
有多个NA

手动输入
令i=1

> dd2<-c(0.50,0.58,0.16,0.52,0.53,0.54,0.46,0.59)
> m<-c()
> i=1
> c<-dd2[-i]
> m<-fitdist(c, distr="beta", method = "mle",start=NULL, fix.arg=NULL)$estimate[1]

m[1] 5.14101

>

就不会得到NA
再令i=2-8也都不会有NA

请问这是为什么？
多谢！