在其自身的输出上重新循环一个函数 [英] Relooping a function over its own output

问题描述

我已经定义了一个函数，希望多次将其重新应用于其自身的输出.我尝试过

I have defined a function which I want to reapply to its own output multiple times. I tried

   replicate(1000,myfunction)

，但意识到这只是将我的函数应用到我的初始输入中1000次，而不是每次都将我的函数应用到新输出中.实际上，我想要的是:

but realised that this is just applying my function to my initial input 1000 times, rather than applying my function to the new output each time. In effect what I desire is:

    function(function(...function(x_0)...))

1000次以上，并且能够在每个阶段看到更改.

1000 times over and being able to see the changes at each stage.

我之前已将b定义为某个长度为7的向量.

I have previous defined b as a certain vector of length 7.

        b_0=b
        C=matrix(0,7,1000)
        for(k in 1:1000){
            b_k=myfun(b_(k-1))
            }
        C=rbind(b_k)
        C

这是我想要的背后的正确主意吗?

Is this the right idea behind what I want?

推荐答案

在这里循环就可以了.

apply_fun_n_times <- function(input, fun, n){
  for(i in 1:n){
    input <- fun(input)
  }
  return(input)
}

addone <- function(x){x+1}

apply_fun_n_times(1, addone, 3)

给出

> apply_fun_n_times(1, addone, 3)
[1] 4

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