Expressions

Expressions are Table-level objects in Granta MI, and are used to define mathematical expressions used in Equations and Logic Attributes.

Expressions can include numeric Attributes and Meta-Attributes from within the same Table, as well as (database-level) Parameters and Constants, referenced as follows:

Type	Format	Examples
Parameter	[P:<name>]	[P:Temperature] [P:Cycles]
Constant	[C:<name>]	[C:Electron Charge] [C:Volume of Ideal Gas at STP]
Attribute	[A:<name>]	[A:Density] [A:Shear modulus]
Meta-Attribute	[A:<parent-name>#<meta-name>]	[A:Density#Sample size] [A:Shear modulus#Std Dev]

For Attributes and Meta-Attributes only, the A: prefix may be omitted. for example, [Density].

The calculation of Expressions is performed in database units. The result will then be converted to the relevant display unit, if it is different.