有没有办法使用R？
将.pdf文件中的数据导入HTML格式我尝试使用以下代码：
library(tm)
filename = "file.pdf"
doc <- readPDF(control = list(text = "-layout"))(elem = list(uri = filename),language = "en",id = "id1")
head(doc)
HTML中的输出显示为：
## $content
## [1] " sample data"
## [2] ""
## [3] " records"
## [4] ""
## [5] " 31 July 2017"
## [6] ""
## [7] ""
## [8] "R Markdown setup
## [9] ""
## [10] ""
## [11] "R Markdown"
## [12] ""
## [13] "This is an R Markdown document. Markdown is a simple formatting syntax for"
## [14] "authoring HTML, PDF, and MS Word documents. For more details on using R"
## [15] "Markdown see http://rmarkdown.rstudio.com."
## [16] "When you click the Knit button a document will be generated that includes"
## [17] "both content as well as the output of any embedded R code chunks within the"
## [18] "document. You can embed an R code chunk like this:"
## [19] "{r cars} summary(cars)"
请帮忙！