
Generate futures contract codes and schedule between dates
gen_futures_codes(contract, from, to, frequency, day_exp,
year_last_digit = FALSE)
contract base name
text dates in format "YYYY-MM-DD"
expiration frequency, e.g. 3 for quarterly contracts
expiration day number, e.g. 15 for middle of month
should only last digit of year present in code?
returns data.table
with columns code, from, to, contract_id
.