如何在我的字符串中命名东西？

Question

我对R是新手，所以我对基本知识有点困惑。目前，我使用以下代码创建了一个字符串：

coldf <- character (length=2500)

我想更改字符中的内容。每50个字符，我就想把它改成别的东西。我想要改变的一些东西是苹果、香蕉、梨和橘子。最后，我希望我的字符串是这样的：

“apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” “apple” "banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana” “banana" “pear”... etc

Answer 1

看起来，您需要的是rep()函数。它有三个基本用法：

1. 通过将向量连接到自己的方式重复一个向量多次
2. 通过重复每个元素重复一个向量多次
3. 通过重复不同的元素重复一个向量不同的次数

为了说明：

x = letters[1:5]
# 1
rep(x, 4)
# [1] "a" "b" "c" "d" "e" "a" "b" "c" "d" "e" "a" "b" "c" "d" "e" "a" "b" "c" "d" "e"
# 2
rep(x, each = 4)
# [1] "a" "a" "a" "a" "b" "b" "b" "b" "c" "c" "c" "c" "d" "d" "d" "d" "e" "e" "e" "e"
# 3
rep(x, 5:1)
# [1] "a" "a" "a" "a" "a" "b" "b" "b" "b" "c" "c" "c" "d" "d" "e"