Quantities is an units and uncertainties package for MATLAB.

Installation

Clone or download the Quantities package to your MATLAB folder as +Quantities.

Usage

Construct a units registry, which contains all units, constants, prefixes and dimensions.

>> ureg = Quantities.unitRegistry

% ureg =

%    Map with properties:

%        Count: 279
%      KeyType: char
%    ValueType: any

Optionally pass verbosity parameter to unitRegistry to see list of units loaded.
```
>> ureg = Quantities.unitRegistry('v',2)
```
Units and constants can be indexed from the unitRegsitry using their name or alias. The unit, constant and quantity class all subclass to double so you can perform any operation on them. Combining a double with a unit creates a quantity class object.
```
>> T1 = 45*ureg('celsius')
% T1 =
    45 ± 0 [degC];

>> T2 = 123.3*ureg.degC
% T2 =
    123.3 ± 0 [degC];
```

Perform operations. All units are converted to base.

>> T2.to_base
% ans =
       396.45 ± 0 [kelvin];

>> heat_loss = ureg.stefan_boltzmann_constant*(T1^4 - T2^4)
% heat_loss =
    -819814 ± 0 [gram*second^-3];

>> heat_loss = ureg.stefan_boltzmann_constant*(T1.to_base^4 - T2.to_base^4)
% heat_loss =
    -819814 ± 0 [gram*second^-3];

Add uncertainty to quantities by calling constructor.

>> T3 = Quantities.quantity(56.2, 1.23, ureg.degC)
% T3 =
    56.2 ± 1.23 [degC];

>> heat_loss = ureg.stefan_boltzmann_constant*(T1^4 - T3^4)
% heat_loss =
    -86228.1 ± 9966.66 [gram*second^-3];

Convert output to different units.

>> heat_loss_kg = heat_loss.convert(ureg.kg/ureg.s^3)
% heat_loss_kg =
    -819.814 ± 0 [kilogram*second^-3];

Determine arbitrary conversion factor.

>> conversion_factor = ureg.mile.convert(ureg.km)
% conversion_factor =
    1.60934 ± 0 [kilometer];

mikofski/Quantities

Installation

Usage