R 在向量末尾添加字符串时遇到问题，该向量为'；名单上有什么

想知道如何在食物中添加另一种元素吗？

---

尝试过食物

g[[“食物”]使用
purr
的一个选项可以是：

g[["food"]] <- c(g[["food"]], "asparagus")

如果

modify_in(g, "food", ~ c(., "asparagus"))

$vegetable
[1] "carrot"

$food
[1] "steak"     "eggs"      "asparagus"

$numbers
[1] 4 2 1 7

---

或者使用

modifyList

from

base R

library(purrr)
map_if(g, names(g) == 'food', ~ c(.x, 'asparagus'))
#$vegetable
#[1] "carrot"

#$food
#[1] "steak"     "eggs"      "asparagus"

#$numbers
#[1] 4 2 1 7

基R解

modifyList(g, list(food = c(g[['food']], 'asparagus')))
#$vegetable
#[1] "carrot"

#$food
#[1] "steak"     "eggs"      "asparagus"

#$numbers
#[1] 4 2 1 7

g[[“食品”]]
modifyList(g, list(food = c(g[['food']], 'asparagus')))
#$vegetable
#[1] "carrot"

#$food
#[1] "steak"     "eggs"      "asparagus"

#$numbers
#[1] 4 2 1 7

g <- within(g,food <- c(food,"asparagus"))

g <- within(g,food <- append(food,"asparagus"))

> g
$vegetable
[1] "carrot"

$food
[1] "steak"     "eggs"      "asparagus"

$numbers
[1] 4 2 1 7