Question

目标是从下面数据的Code列创建两个新列。一个是数字，另一个是代码（因子）。我怎么做？我试过了ifelse()，但它给了错误。

structure(list(Potreiro = structure(c(3L, 3L, 3L, 3L, 
3L, 4L, 3L, 4L, 3L, 4L), .Label = c("1A", "6B", "7A", "7B"), class = 
"factor"), Code = structure(c(4L, 1L, 8L, 3L, 2L, 4L, 6L, 5L, 8L, 7L ), 
.Label = c("2", "3", "4", "5", "50%", "70%", "ac", "ad", "av", "cd", "de", 
"Dem"), class = "factor")), .Names = c("Potreiro", "Code"), row.names = 
c(NA, 10L), class = "data.frame")

感谢!!!

Answer 1

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library(dplyr) library(stringr) df <- structure(list(Potreiro = structure(c(3L, 3L, 3L, 3L, 3L, 4L, 3L, 4L, 3L, 4L), .Label = c("1A", "6B", "7A", "7B"), class = "factor"), Code = structure(c(4L, 1L, 8L, 3L, 2L, 4L, 6L, 5L, 8L, 7L ), .Label = c("2", "3", "4", "5", "50%", "70%", "ac", "ad", "av", "cd", "de", "Dem"), class = "factor")), .Names = c("Potreiro", "Code"), row.names = c(NA, 10L), class = "data.frame") df %>% mutate( number = str_extract_all(Code, "\\d+"), word = str_extract(Code, "\\D[^%]") )变量正则表达式正在查找数字，并且至少会匹配一次number。 \\d+变量正则表达式在剥离％符号时不会查找数字。

结果：

word

Answer 2

我会这样做：

df <- 
         structure(list(Potreiro = structure(c(3L, 3L, 3L, 3L, 
                                      3L, 4L, 3L, 4L, 3L, 4L), .Label = c("1A", "6B", "7A", "7B"), class = 
                                      "factor"), Code = structure(c(4L, 1L, 8L, 3L, 2L, 4L, 6L, 5L, 8L, 7L ), 
                                                                  .Label = c("2", "3", "4", "5", "50%", "70%", "ac", "ad", "av", "cd", "de", 
                                                                             "Dem"), class = "factor")), .Names = c("Potreiro", "Code"), row.names = 
            c(NA, 10L), class = "data.frame")

arenum <- sapply(df$Code, function (x) grepl('[[:digit:]]', x))
df$codenum <- ifelse(arenum, as.character(df$Code), NaN)
df$codechar <- ifelse(!arenum, as.character(df$Code), NaN)
df

如果你真的不想要任何其他东西而不是数字改变arnum：

arenum <- sapply(df$Code, function (x) gsub('[[:digit:]]', '', x) == '')

Answer 3

以下是使用extract

的选项

library(dplyr)
library(tidyr)
df %>% 
  extract(Code, into = c('number', 'word'), '(\\d*)([a-z]*)', remove = FALSE, convert = TRUE)
#  Potreiro Code number word
#1        7A    5      5     
#2        7A    2      2     
#3        7A   ad     NA   ad
#4        7A    4      4     
#5        7A    3      3     
#6        7B    5      5     
#7        7A  70%     70     
#8        7B  50%     50     
#9        7A   ad     NA   ad
#10       7B   ac     NA   ac

从R中的另一列创建并启动列

3 个答案: