We do not have to use the chunk option names given in knitr; we can set aliases for them. The aliases are a named character vector; the names are aliases and the elements in this vector are the real option names.
Named arguments. Argument names are aliases, and argument values are real option names.
opts_knit$get('aliases') is modified as the side effect.
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set_alias(w = "fig.width", h = "fig.height") # then we can use options w and h in chunk headers instead of fig.width and # fig.height
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