distillery: Methods to Distill Information from R Objects

Tests to see if an object is a formula or not.

1 | ```
is.formula(x)
``` |

`x` |
An R object. |

This is a very simple function that simplifies checking that the class of an object is a formula or not.

single logical

Eric Gilleland

1 2 | ```
is.formula(~1)
is.formula(1:3)
``` |

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