Modern R Programming Cookbook

How it works…

Let's take a look at the preceding process sequentially:

1. The initial phase was doing the PubMed search through the pubmed.mineR library.
2. The search keyword is converted into the PubMed search_query term using the EUtilsSummary() function.
3. Once the search_query term has been created, it parses through EUtilsGet() to get the actual search result from PubMed. The search results are extracted into an object.
4. Later on, the abstract text has been retrieved, and a vector has been created.
5. Once the vector of the text data has been created, the pre-processing step began from here. Using the tm library, you have created the corpus of the abstract by giving the vector input by the following code line:

 AbstractCorpus <- Corpus(VectorSource(abstracts)) ...