Query or set Quandl API Key
quandl_api_key(api_key)
Optionally passed parameter to set Quandl api_key
.
Returns invisibly the currently set api_key
A wrapper for Quandl::Quandl.api_key()
tq_get()
get = "quandl"
if (FALSE) {
quandl_api_key(api_key = "foobar")
}