R语言字符串拼接变量输出_r语言str中混入变量-优快云博客

本文介绍了R语言中用于字符串拼接的函数paste、paste0以及stringr包中的str_c。对比了它们的使用方法和参数，包括sep（内部拼接符）和collapse（外部拼接符）。示例展示了如何利用这些函数进行字符串的组合，并特别指出str_c在处理NA值时的不同处理方式。

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https://www.jianshu.com/p/09c865ffaafe

paste {base}

语法：
paste (…, sep = " ", collapse = NULL)
paste0(…, collapse = NULL)

两个参数：sep字符串内的拼接符；collapse字符串间的拼接符。paste与paste0的区别：paste0参数sep默认为空字符，paste的参数sep默认为空格。

paste("1st", "2nd", "3rd", collapse = ", ")
[1] "1st 2nd 3rd"

paste("1st", "2nd", "3rd", sep = ", ")
[1] "1st, 2nd, 3rd"

paste(c("a", "b", "c"),c(1:3) , sep = ": ", collapse = "; ")
[1] "a: 1; b: 2; c: 3"

str_c {stringr}

语法：
str_c(…, sep = “”, collapse = NULL)

参数：与paste一致，但对NA的处理方法不一致。

library("stringr")
str_c("Letter: ", letters)
 [1] "Letter: a" "Letter: b" "Letter: c" "Letter: d" "Letter: e" "Letter: f" "Letter: g" "Letter: h"
 [9] "Letter: i" "Letter: j" "Letter: k" "Letter: l" "Letter: m" "Letter: n" "Letter: o" "Letter: p"
[17] "Letter: q" "Letter: r" "Letter: s" "Letter: t" "Letter: u" "Letter: v" "Letter: w" "Letter: x"
[25] "Letter: y" "Letter: z"

#str_c在对含NA的字符拼接后，结果仍然为NA
str_c(c("a", NA, "b"), "-d")
[1] "a-d" NA    "b-d"
#paste在对含NA的字符拼接后，NA被当作为“NA”字符串处理
paste(c("a", NA, "b"), "-d")
[1] "a -d"  "NA -d" "b -d"