Syntax
where
The syntax for the VAR: command given here is used for the
declaration of single variances and covariances. The first form of the
syntax is used to specify the covariance between the elements
BD>var : v(2,temperature,bloodpressure)=2.5
BD>var : v(1,X)=(ln (%c)+ln (%d))
are the names of elements which must
already exist, 
is a valid equation, and S is a
belief store number.
and
in belief store number S to be the value of the equation E.
The round brackets surrounding the equation are essential unless
E is a real number. The two names and are allowed to be
the same, implying of course the declaration of a variance. The second
fom of the syntax is a special short form of the first syntax when
and we wish to specify a variance. Examples are:
,N 
)= (E)