My solution when I run into mysteries is to put ‘browser()’ in the function just before
or after the line of interest. The magnitude and direction of my stupidity usually become 
clear quickly.

      --Patrick Burns

Favorite R packages in no particular order:

tabulizer

Rcpp

pdftools

stargazer

ggplot2

quantmod

gganimate

Repetitive phrases:

Hello and welcome to StackOverflow please read How do I ask a good question? and provide a reproducible example.