Numeric (Real) Expressions

In AVEVA E3D Design expressions, integers are treated as reals; they are fully interchangeable. Numeric expressions can contain:

• Numbers, for example: 32, 10.1.

• Numbers can be given as integer exponents, for example: 10 exp 5, and 5 E 6.

• Values (numbers) can be qualified by units. This introduces dimensional analysis into the expression. The valid units are any standard appropriate unit qualifiers for example MM, M/etres, IN/ches, FT, FEET, kg, lb, kgf/m3, pascal. These may be preceded by SQU/are, CUBIC, CUB/e to denote non-linear Values, or alternatively they can have power indices appended. For example: 100 mm, 10 exp 5 cubic feet, 10m3, 20newton.m-2. Feet and inches can be shown as, for example, 10'6.

• AVEVA E3D Design attributes of type number, for example: XLEN.

• Position, direction and orientation attributes which have a subscript to indicate which part of the array is required. For example, POS[2] means the second element of the POSITION attribute; that is, the northing.

  Note: Position, direction and orientation attributes without subscripts can only be used in number array expressions.

• The keyword PI (3.142).

• Numeric operators.

• Numeric functions.