The filename of figure files is the combination of options
label. This function returns the path of figures for the current
chunk by default.
A filename suffix; if it is non-empty and does not
contain a dot
A list of options; by default the options of the current chunk.
The current figure number. The default is the internal chunk option
A character vector of the form ‘fig.path-label-i.suffix’.
When there are special characters (not alphanumeric or - or _) in the path, they will be automatically replaced with _. For example, ‘a b/c.d-’ will be sanitized to ‘a_b/c_d-’. This makes the filenames safe to LaTeX.
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