use Rcpp vignette style

[eddelbuettel]

@binxiangni I updated the vignette a little, see a (temp) copy of the pdf for a quick glance.

[binxiangni]

Looks good. There might be an inconsistency due to me. Subsection 2.7.3 includes library(Matrix), but others don't. Maybe we can just remove it. The other part is great. You can merge it. Thank you!

[eddelbuettel]

Maybe we can just remove it.

Done!

[eddelbuettel]

BTW, one downside is that you need a helper script such as the snippet below to compile the vignette.

#!/usr/bin/Rscript

## use given argument(s) as target files, or else default to .Rnw files in directory
files <- if (length(commandArgs(TRUE)) == 0) dir(pattern="*.Rnw") else commandArgs(TRUE)

## convert all files from Rnw to pdf using the highlight driver
invisible(sapply(files, function(srcfile) {
    Sweave(srcfile, driver=highlight::HighlightWeaveLatex())
    tools::texi2pdf(gsub(".Rnw", ".tex", srcfile))
}))

[binxiangni]

Not familiar with that. I just compile my original one in Rstudio. Thanks for reminding. Really learned a lot from you this summer.

[eddelbuettel]

It's the non-standard (but perfectly fine and permitted) vignette engine we use: based on highlight. All pretty easy on Linux, and (I presume) possible on macOS...