//! Previous coupon already paid at a given date
/*! Expected previous coupon: depending on (the bond and) the given
* date the coupon can be historic, deterministic or expected in a
* stochastic sense. When the bond settlement date is used the coupon
* is the last paid one.
*
* The current bond settlement is used if no date is given.
*/
public double previousCouponRate(Date settlement = null)
{
return(BondFunctions.previousCouponRate(this, settlement));
}