.get_rate: get an exchange rate series
Description
Try to find exchange rate data in an environment, inverting if necessary.
Usage
.get_rate(ccy1, ccy2, env = .GlobalEnv)
Value
xts object with as many columns as practicable.
Arguments
- ccy1
chr name of 1st currency
- ccy2
chr name of 2nd currency
- env
environment in which to look for data.