A number of different operations can be performed on or with
DiscountFactor objects. Methods have been defined for base
package generic operations including arithmetic and comparison.
The operations are:
c: concatenates a vector of DiscountFactor objects
[: extract parts of a DiscountFactor vector
[<-: replace parts of a DiscountFactor vector
rep: repeat a DiscountFactor object
length: determines the length of a DiscountFactor vector
*: multiplication of DiscountFactor objects. The end
date of the first discount factor object must be equivalent to the start
date of the second (or vice versa). Arguments are recycled as necessary.
/: division of DiscountFactor objects. The start date
date of both arguments must be the same. Arguments are recycled as necessary.
<, >, <=, >=, ==, !=: these operate in the standard way on the
discount_factor field.