Units and dimensions#
Generated on 22/08/23. Please file any issues or questions at the issue tracker here.
Dimension#
A Dimenson element associated a name with a particular combination of the standards SI base dimensions, mass, lenght, time, current, temperature and amount if substance (moles). Fractional dimensions are not currently supported.
name |
String |
The name to be used when referring to this dimension from variable declaration or units |
m |
int |
Mass |
l |
int |
Length |
t |
int |
Time |
i |
int |
Current |
k |
int |
Temperature |
n |
int |
Amount of substance |
j |
int |
Luminous intensity |
Unit#
A Unit asociates a symbol with a dimension and a power of ten. For non-metric units a scale can be provided, as in ‘1 inch = 0.0254 m’. In this case there is a degeneracy between the power and the scale which is best resolved by not using the two together. The offset parameter is available for units which are not zero-offset, such as farenheit.
name |
String |
As with constants, units are only referred to within expressions using their symbols, so the name is just for readability. |
symbol |
String |
The symbol is used to refer to this unit inside compound expressions coutaining a number and a unit symbol. Such expressions can only occur on the right hand side of assignments statements. |
dimension |
String |
Reference to the dimension for this unit |
power |
int |
Power of ten |
scale |
double |
Scale, only to be used for scales which are not powers of ten |
offset |
double |
Offset for non zero-offset units |
Assertion#
Assertions are not strictly part of the model, but can be included in a file as a consistency check.
dimension |
String |
The name of a dimension |
matches |
String |
An expression involving dimensions. The dimensionality of the expression should match the dimensionality of the dimension reference. |