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The current release of dplyr (v 0.4.1)
offers lot more flexibility regarding usage of important verbs in non-interactive mode. In this post, I’m exploring different possible use-cases.
- group_by_, select_, rename_:
For group_by_, select_ and rename_, we can pass a character vector of variable names as an argument to .dots parameter.
To use filter_ function, we need to pass filter criteria as a parameter to .dots. The criteria can be created using lazyeval::interp function.
- mutate_, transmute_, summarise_:
We need to provide 2 things to these functions – a list of functions to be applied on the input variables (with corresponding input variables) and a character vector of output variables names. These 2 things can be passed to the .dots argument using combination of lazyeval::interp and setNames function.
For 2 table verbs, there’s no *_join_ function and we don’t need one for general purposes. We can just pass a named vector to by argument. setNames function comes in handy while doing this.
The R Code for the above mentioned use cases is shown below and can also be found on this GitHub Gist.