R中同一句话内的文本挖掘

Question

我有一个文本文件

"I am writing today. Today I am thinking of writing. Today is great day"

我试图在 "writing today" 是 mentioned.It 的句子中找到实例的数量，可能会发生 "writing today" 不在一起但仍然是同一句子的一部分（例如：第二句), 也需要捕获它。

因此在上面的示例中，我的计数将为 2。

知道如何在 R 中做到这一点吗？ TIA

Answer 1

有很多方法可以做到这一点，但是使用 tidytext，

library(tidyverse)
library(tidytext)

data_frame(text = "I am writing today. Today I am thinking of writing. Today is great day") %>%
    unnest_tokens(sentence, text, 'sentences', to_lower = FALSE) %>%
    mutate(sentence_number = row_number()) %>%
    unnest_tokens(word, sentence, 'words', drop = FALSE) %>%
    group_by(sentence_number) %>% 
    filter('today' %in% word, 'writing' %in% word) %>% 
    select(-word) %>% distinct() %>% ungroup() %>%
    mutate(count = n())

#> # A tibble: 2 × 3
#>                          sentence sentence_number count
#>                             <chr>           <int> <int>
#> 1             I am writing today.               1     2
#> 2 Today I am thinking of writing.               2     2

R中同一句话内的文本挖掘

text mining within same sentence in R

r

text-mining