SimBiology^®

Composition - Unit composition

Description

The Composition property holds the composition of a unit object. The Composition property shows the combination of base and derived units that defines the unit. For example, molarity is the name of the unit and the composition is mole/liter. Base units are the set of units used to define all unit quantity equations. Derived units are defined using base units or mixtures of base and derived units.

Valid physical quantities for reaction rates are amount/time, mass/time, or concentration/time.

Characteristics

Applies to	Object: `Unit`
Data type	`char string`
Data values	Valid combination of units and prefixes from the library. Default is `''` (empty).
Access	Read/write

Examples

This example shows you how to create a user-defined unit, add it to the user-defined library, and query the Composition property.

Create a unit for the rate constants of a second-order reaction.
```
unitObj = sbiounit('secondconstant', '1/molarity*second', 1); 
```

Query the Composition property.

get(unitObj, 'Composition')

ans =

1/molarity*second

Change the Composition property.

set(unitObj, 'Composition', 'liter/mole*second'))

ans =

liter/mole*second

Add the unit to the user-defined library.
```
sbioaddtolibrary(unitObj);
```

Composition - Unit composition

Description

Characteristics

Examples

See Also