Generating knitr reports
knitr, r
Solution
If I understand correctly, you are going to use the same Rnw file for each county, so only the variable `display_county` will be different for each county. I would first make the call to the database to get all the names of counties and store them in a vector (say... `myCounties`). After that, your reports can be generated with a script containing the following:
for(dc in myCounties) {
knit2pdf(input='county_report.Rnw', output=paste0(dc, '_county_report.pdf'))
}
To handle errors more effectively, you can also wrap the knit2pdf call on a tryCatch statement:
for(dc in myCounties) {
tryCatch(knit2pdf(input='county_report.Rnw', output=paste0(dc, '_county_report.pdf')))
}
Problem
I'm pretty new to `knitr`, but I've written a script that generates a report for a county. One of the first lines in the first code chunk is `display_county <- "King"`, and it queries a database to make all sorts of nice things about King County. Now I want to create reports for every county in my state. The only line in the script that needs be changed is the definition of `display_county`. I know the `brew` packages is set up for stuff like this, and I know there's overlap between `brew` and `knitr`, but I don't know what I should be using. This answer using Brew and Sweave would work with minor modifications, but is there a nice `knitr` way to bypass `brew`?