R-将For循环中的值保存在向量或列表中 [英] R - Saving the values from a For loop in a vector or list

问题描述

我正在尝试将此for循环的每次迭代保存在向量中.

I'm trying to save each iteration of this for loop in a vector.

for (i in 1:177) { a <- geomean(er1$CW[1:i]) }

for (i in 1:177) { a <- geomean(er1$CW[1:i]) }

基本上，我有177个值的列表，我希望脚本查找列表的累积几何平均值.现在，它只会给我最终值，不会将每次循环迭代另存为列表或向量中的单独值.

Basically, I have a list of 177 values and I'd like the script to find the cumulative geometric mean of the list going one by one. Right now it will only give me the final value, it won't save each loop iteration as a separate value in a list or vector.

推荐答案

您的代码不起作用的原因是对象a在每次迭代中均被覆盖.例如，以下代码精确地完成了您想要的工作:

The reason your code does not work is that the object ais overwritten in each iteration. The following code for instance does what precisely what you desire:

    a <- c()
    for(i in 1:177){
      a[i] <- geomean(er1$CW[1:i])
    }

或者，这也可以工作:

    for(i in 1:177){
      if(i != 1){
      a <- rbind(a, geomean(er1$CW[1:i]))
      }
      if(i == 1){
        a <- geomean(er1$CW[1:i])
      }
    }

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