`R/zip_helper_functions.R`

`zip_distance.Rd`

Calculate the distance between two ZIP codes in miles

`zip_distance(zipcode_a, zipcode_b, lonlat = TRUE, units = "miles")`

- zipcode_a
First vector of ZIP codes

- zipcode_b
Second vector of ZIP codes

- lonlat
lonlat argument to pass to raster::pointDistance() to select method of distance calculation. Default is TRUE to calculate distance over a spherical projection. FALSE will calculate the distance in Euclidean (planar) space.

- units
Specify which units to return distance calculations in. Choices include meters or miles.

a data.frame containing a column for each ZIP code and a new column containing the distance between the two columns of ZIP code

```
zip_distance("08731", "08901")
#> zipcode_a zipcode_b distance
#> 1 08731 08901 40.7
```