General remarks

• A legal equation is an infix sequence of operators and operands. In addition to the usual operators described in §21.2 and §21.9 a considerable number of operators and operands peculiar to [B/D] are available, allowing access to [B/D] outputs. These are described in the remaining sections of this chapter.
• A pair of round brackets is generally used to delimit an equation. In certain situations the delimiting pair of brackets, is redundant, and may be omitted. However, in doubt you should enclose an equation within round brackets - they cannot harm.
• A pair of round brackets enclosing nothing, namely (), causes an error.
• Boolean operators have the lowest priority in equations. For example, (1=1*2) is evaluated as 0, because (1*2) is evaluated first.
• Functional forms (defined within FE:  and FVAR:  commands) are allowed within equations. See the relevant [B/D] operators ex , corr , and var .
• A list of operands and operators is available interactively by issuing the LOOK:  command with arguments operands  and operators  respectively.