21.9 Simple Transforms
We start with some manual special transforms we may want to do. For
example, we might want to replace /'', used sometimes to separate alternative words, with a space. This will avoid the two words being run into one string of characters through the transformations. We might also replace@’’ and ``’’ with a space, for the same
reason.
To create a custom transformation we make use of tm::content_transformer() to create a function to achieve the transformation, and then apply it to the corpus using tm::tm_map().
toSpace <- content_transformer(function(x, pattern) gsub(pattern, " ", x))
docs <- tm_map(docs, toSpace, "/")
docs <- tm_map(docs, toSpace, "@")
docs <- tm_map(docs, toSpace, "\\|")This can be done with a single call:
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