我想将列分成两列,然后提取数字并将其单独保留在一列中。
df <- data.frame(V1 = c("[1] Strongly disagree", "[2] Somewhat disagree", "[3] Neither", "[4] Somewhat agree", "[5] Strongly agree"))
V1
[1] Strongly disagree
[2] Somewhat disagree
[3] Neither
[4] Somewhat agree
[5] Strongly agree
我尝试使用 tidyr
中的 separate
函数:
tidyr::separate(df, V1, into = c("Value", "Label"), sep = "] ")
Value Label
[1 Strongly disagree
[2 Somewhat disagree
[3 Neither
[4 Somewhat agree
[5 Strongly agree
我也许可以用另一个函数删除 [
,但我想知道我是否可以一步解决这个问题,并想知道是否有另一个函数可以完成这项工作。
我想把这个弄到最后
Label Value
Strongly disagree 1
Somewhat disagree 2
Neither 3
Somewhat agree 4
Strongly agree 5
最佳答案
如果您更喜欢 base R,这里是 base R 解决方案:
df <- data.frame(V1 = c("[1] Strongly disagree", "[2] Somewhat disagree", "[3] Neither", "[4] Somewhat agree", "[5] Strongly agree"))
df$value = as.numeric(regmatches(df$V1, regexpr(r"(\d)", df$V1)))
df$V1 = regmatches(df$V1, regexpr("(?<=] ).*", df$V1, perl=TRUE))
df
#> V1 value
#> 1 Strongly disagree 1
#> 2 Somewhat disagree 2
#> 3 Neither 3
#> 4 Somewhat agree 4
#> 5 Strongly agree 5
由 reprex package 创建于 2020-09-05 (v0.3.0)
regmatches
是一个基本的 R 函数,它从向量中返回匹配的值,它以一个向量和一个 regexpr
作为输入。对象。
如果第一种情况(value
列)\d
用于提取数字。
在第二种情况下,(?<=] ).*
用于返回在 ]
之后匹配的任何内容,
https://stackoverflow.com/questions/63745883/