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.Rnw is a file extension used for documents with LaTeX markup and {knitr} and/or {sweave} chunks.

.Rnw is a file extension used for documents with LaTeX markup and and/or chunks.

determines the appropriate set of patterns (regular expressions) to use to extract code and chunk options based on the file extension (if the patterns are not provided in advance). See ?knit_patterns for more information.