如何将一个观察分解成多个sub-observations？

Question

我的dataframe包含几篇文章合集，df$title代表标题，df$text代表每篇文章的内容。我需要将每篇文章分成几个段落。以下是我如何分解一篇文章：

pattern = "\bM(?:rs?|s)\.\s"
aa <- str_replace_all( text1, pattern, "XXXX")
bb <- unlist(strsplit(aa, "XXXX"))
cc <- bb[-1]
dd <- gsub("[\]", " ", cc)
paragraph vector <- gsub("[^[:alnum:]]", " ", dd)

如何用文章标题标记每个段落并将分解工作应用到整个专栏 (df$text)？我希望每个段落成为一个观察（而不是一篇文章作为观察）。

Answer 1

这是一个简单的例子，每个段落由两个空行分隔：

library(tidyverse)

data <- tibble(
  title = c("The Book of words", "A poem"),
  text = c("It was a dark and stormy night. \n\n And this is another paragraph.", "This\n\nis\n\nthe\n\nEnd")
)

cat(data$text[[1]])
#> It was a dark and stormy night. 
#> 
#>  And this is another paragraph.
cat(data$text[[2]])
#> This
#> 
#> is
#> 
#> the
#> 
#> End

data %>%
  transmute(
    title,
    paragraph = text %>% map(~ {
      .x %>%
        str_split("\n\n") %>%
        simplify() %>%
        map_chr(str_trim)
    })
  ) %>%
  unnest(paragraph)
#> # A tibble: 6 × 2
#>   title             paragraph                      
#>   <chr>             <chr>                          
#> 1 The Book of words It was a dark and stormy night.
#> 2 The Book of words And this is another paragraph. 
#> 3 A poem            This                           
#> 4 A poem            is                             
#> 5 A poem            the                            
#> 6 A poem            End

^{由 reprex package (v2.0.1)}

于 2021-09-26 创建

如何将一个观察分解成多个sub-observations？

How to break down one observation into several sub-observations?

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