Notes:
The maturity date used by this routine can be a maturity/redemption date.
Results:
The coupon rate is calculated using the industry standard rules or generally accepted practices. The function returns the coupon rate as a percent, accurate to as many places as specified by the tolerance with the maximum as the number of place supported by a double precision value.
Error Conditions:
Returned values should be ignored for a non-zero status. See Errors.