我正在寻找一个函数,该函数允许我添加新列以将称为ID的值添加到字符串,即:
我有一个带有您的ID的单词列表:
car = 9112
red = 9512
employee = 6117
sky = 2324
words<- c("car", "sky", "red", "employee", "domestic")
match<- c("car", "red", "domestic", "employee", "sky")
通过读取一个excel文件进行比较,如果发现值等于我的矢量单词,它将用其ID替换该单词,但保留原始单词
x10<- c(words)# string
words.corpus <- c(L4$`match`) # pattern
idwords.corpus <- c(L4$`ID`) # replace
words.corpus <- paste0("\\A",idwords.corpus, "\\z|\\A", words.corpus,"\\z")
vect.corpus <- idwords.corpus
names(vect.corpus) <- words.corpus
data15 <- str_replace_all(x10, vect.corpus)
结果:
data15:
" 9112", "2324", "9512", "6117", "employee"
我要寻找的是用ID添加新列,而不是用ID替换单词
words ID
car 9112
red 9512
employee 6117
sky 2324
domestic domestic
答案 0 :(得分:0)
我将使用 data.table 基于固定字词值进行快速查找。尽管并不能100%清楚您的要求,但听起来好像您想在匹配的情况下用索引值替换单词,或者如果没有则将其保留为单词。这段代码可以做到:
library("data.table")
# associate your ids with fixed word matches in a named numeric vector
ids <- data.table(
word = c("car", "red", "employee", "sky"),
ID = c(9112, 9512, 6117, 2324)
)
setkey(ids, word)
# this is what you would read in
data <- data.table(
word = c("car", "sky", "red", "employee", "domestic", "sky")
)
setkey(data, word)
data <- ids[data]
# replace NAs from no match with word
data[, ID := ifelse(is.na(ID), word, ID)]
data
## word ID
## 1: car 9112
## 2: domestic domestic
## 3: employee 6117
## 4: red 9512
## 5: sky 2324
## 6: sky 2324
此处“国内”不匹配,因此它仍保留为ID列中的单词。我还重复了“天空”,以说明这对于一个单词的每个实例将如何工作。
如果要保留原始排序顺序,可以在合并之前创建一个索引变量,然后按该索引变量对输出重新排序。