write2Helper functions for write2.
verbatim(...)code.chunk(..., chunk.opts = "r")
For verbatim, objects to print out monospaced (as if in the terminal). For code.chunk,
either expressions or single character strings to paste into the code chunk.
A single character string giving the code chunk options. Make sure to specify the engine!
The "verbatim" class is to tell write2 to print the object inside
a section surrounded by three back ticks. The results will look like it would in the terminal (monospaced).
code.chunk() is to write explicit code chunks in the .Rmd file; it captures the call and writes it to the
file, to execute upon knitting.