R：带有矢量模式的 agrep

Question

我有一个模式向量，需要对它们使用 agrep。问题是 agrep 似乎一次只采用一种模式。

patt <- c("test","10 Barrel")
lut  <- c("1 Barrel","10 Barrel Brewing","Harpoon 100 Barrel Series","resr","rest","tesr")

for (i in 1:length(patt)) {
  print(agrep(patt[i],lut,max=1,v=T))
}

结果：

[1] "rest" "tesr"
[1] "1 Barrel"                  "10 Barrel Brewing"         "Harpoon 100 Barrel Series"

for 在长模式上很慢，因此尝试以矢量化形式进行：

VecMatch1 = function(string, stringVector){
  stringVector[agrep(string, stringVector, max = 1)]
}
a = VecMatch1(patt,lut)

Warning message:
In agrep(string, stringVector, max = 1) :
  argument 'pattern' has length > 1 and only the first element will be used

可能 lapply 等函数可以提供帮助？谢谢！！

Answer 1

使用lapply:

lapply(patt, agrep, x=lut, max.distance=c(cost=1, all=1), value=TRUE)

[[1]]
[1] "rest" "tesr"

[[2]]
[1] "1 Barrel"                  "10 Barrel Brewing"         "Harpoon 100 Barrel Series"

您可能可以使用 dplyr 或 data.table 获得更快的性能。

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