如何将一个单词拆分为双元组，包括重复的词组? [英] How can I split a word into bi-grams, including repeated ones?

问题描述

我正在尝试将单词拆分为双元词组.我正在使用 qlcMatrix 包，但它只返回不同的二元组.例如，对于单词 "detected"，它只返回 "te" 一次.这是我使用的命令

I am trying to split a word into bi-grams. I am using the qlcMatrix package, but it only returns distinct bi-grams. For example, for the word "detected", it only returns "te" once. This is the command I use

test_domain <- c("detected")
library("qlcMatrix", lib.loc="~/R/win-library/3.2")
bigram1 <- splitStrings(test_domain, sep = "", bigrams = TRUE, left.boundary = "", right.boundary = "")$bigrams

这是我得到的结果:

bigram1
# [1] "ec" "ed" "de" "te" "ct" "et"

推荐答案

另一种使用 R 基础的方法是使用 mapply 和 substr:

Another way to do it with base R is to use mapply and substr:

nc <- nchar("detected")
mapply(function(x, y){substr("detected", x, y)}, x=1:(nc-1), y=2:nc)
# [1] "de" "et" "te" "ec" "ct" "te" "ed"

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