vctrs | Generic programming with typed R vectors

tl;dr somewhere deep in the guts of the cli package (called to generate the pretty-printed output about column types), the code is generating a random string to use as a label.

A major clue is that

In case anyone else has this problem in the future I will share the solution that worked for me:

My problem was in using functions from the magicfor package in my function. Thanks to this answer to another question I was able to change my for loop so that it works:

A combination of reinstalling R Studio after uninstalling MikTex, and finally installing the R package tinytex worked.

I think @samcarter_is_at_topanswers.xyz was right that "the problem was an outdated latex version. utf8 became the default encoding some time ago, but if your tex version was older then such special characters would cause problems. "

Lessons learned:

1. The tinytex package is all you need for R Markdown. You can even open tex files in R Studio to edit and compile them to pdf. See how to install it here.

2. Update MikTex frequently. I assumed that it automatically updated when needed, but that seems not to be true. Windows > MikTex > Update. It's that simple. Remembering to do it is another thing if you decide to use it.

3. Being able to check that the environment paths are all there and are pointing to the right directory didn't help in this case, but it was good to learn. This link was helpful.

This is tricky, and the answer below doesn't solve this 100%. Now there are a number of different ways assertr lets you handle errors/stops, just see ?error_stop (which is the default).

You need to not only filter out rows that fail, but also collect them (all) for later inspection.

Below I wrote my own error handler. It fetches those rows that fail, filter them away, and stores them in the global environment under the varibale my.failed.rows.

It looks like data_frame is relatively new to vctrs. You may need to update your vctrs package. You may have accidentally rolled back to an earlier version?

Seems it was added here:

vctrs 0.3.3 2020-08-27

This is likely due to vctrs not being updated. See this issue on GitHub: https://github.com/juliasilge/tidytext/issues/191

In brief, try: update.packages() and then forcing with install.packages("vctrs")

Here, we could get the combn to return the table of factor converted x with levels specified as 'a', rbind the inner list and then the outer list to return a matrix. Change the binary output to '.' and 'x' for 0 and 1

I'm not absolutely sure, but I'd almost bet money that this is what you need:

I jumped the gun and posted this question without fully reading the documentation. Here is the correct approach as outlined here