This function extracts the LaTeX preamble of the parent document to use for the child document, so that the child document can be compiled as an individual document.
set_parent(parent)The preamble is extracted and stored to be used later when the complete output is written.
Path to the parent document, relative to the current child document.
When the preamble of the parent document also contains code chunks and inline R code, they will be evaluated as if they were in this child document. For examples, when knitr hooks or other options are set in the preamble of the parent document, it will apply to the child document as well.
## can use, e.g. \Sexpr{set_parent('parent_doc.Rnw')} or
# <>=
# set_parent('parent_doc.Rnw')
# @
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