The three most common open source technologies for writing data science programs are Python, SciLab, and R. Here's how to write program-defined functions in R. There's no clear definition of the term ...

See how the purrr package’s possibly() function helps you flag errors and keep going when applying a function over multiple objects in R. It’s frustrating to see your code choke part of the way ...

Note the column name, mpg, is unquoted. That feature hasn’t been handy, though, if you want to write your own R functions using the tidyverse. That’s because base R functions usually need quoted ...