- Fixed Properties
- Variable Properties
Variable properties represent process data that may change with each run or experiment. Fixed properties have the same single value throughout all runs of all experiments (more details on fixed properties).
Below, is a "Water" resource with properties such as "Temperature" and "pH". Target values and upper and lower specification limits can be set for properties. The "Water" resource also has "Salt" and "Bottle" components. These components have properties such as "Volume" and "Concentration" which in turn have their own specifications.
The values of variable properties can also be auto-calculated using formulas, which are accessed using by clicking . For example, "Salt Concentration", could be automatically calculated based on the salt mass and the water volume.
Valid formulas must use infix notation and can contain standard operational characters (parentheses, +, -, *, /, ^). Unary operators are supported, including:
- logarithm, e.g., log10(x)
- natural logarithm e.g., log(x)
- exponential, e.g., exp(x)
- square root, e.g., sqrt(x)
- absolute value, e.g., abs(x)
The mathematical constants pi and e are also supported. The mathematical constant e is distinct from scientific notation 10e1, which is also understood in context.