Modern R Programming Cookbook

How to do it…

Let's perform the following steps to create a word cloud:

1. Perform a literature search through PubMed and the retrieve abstract texts.
2. Perform pre-processing using the tm library.
3. Create a term document matrix.
4. Create a word cloud.

The preceding steps are implemented as follows:

        library(pubmed.mineR)        library(RISmed)        keyword <- "Deep Learning"        search_query <- EUtilsSummary(keyword, retmax=50)        summary(search_query)        extractedResult <- EUtilsGet(search_query)        pmid <- PMID(extractedResult)        years <- YearPubmed(extractedResult)        Jtitle <- Title(extractedResult)        articleTitle <- ArticleTitle(extractedResult)        abstracts <- AbstractText(extractedResult)        library(tm)        AbstractCorpus <- Corpus(VectorSource(abstracts)) AbstractCorpus <- tm_map(AbstractCorpus, ...