Examples

In the first example, the assignment named A is defined to be the linear combination . None of these quantities need exist at this point, and if they do not exist when the assignment is used, they will be ignored. The examples include such quantities as %c (meaning the constant c) and #kda.s (meaning the function kda.s), which are described more fully in chapter 7.

1. BD>assign : A=B+(2) C+E.1

2. BD>assign : G.3.4=(%c)+H.2+F+ (26)

3. BD>assign : D.s.t=(#kda.s+#kdb.s) D.s.(t-1) + (#kdb.s) D.s.(t-2)+(#kdc.s)+E.s.t

4. BD>assign : F.s.t=B.s.t+B.1.1

In the second of these examples, the assignment named is defined to be the linear combination , where %c is some constant which will be evaluated at this point (use a function rather than a constant if you wish to delay the evaluation). Notice that this example contains two scalar parts.

The third example is taken from a genuine application, and involves part of the specification of an autoregressive error structure. It makes the definition

where the 's are functions of s, the D's are vectors of quantities related to similar previous quantities via the given relationship, and the terms are noises.

The fourth example shows a definition part which consists of a component which includes varying indices, and a component which does not. Notice that this results for example in the definition of , so that the component is repeated. This is permissible, and the definition part will be taken to be .