mikofski/Quantities

Quantities is an units and uncertainties package for MATLAB.
Installation
============
Clone or download the Quantities package to your MATLAB folder as `+Quantities`.

Usage
=====
1. 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

2. Optionally pass `verbosity` parameter to `unitRegistry` to see list of units
loaded.

>> ureg = Quantities.unitRegistry('v',2)

3. 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];

4. 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];

5. 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];

6. 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];

7. Determine arbitrary conversion factor.

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