Physical units

Using-units

1. Generate a physical quantity by multiplying a scalar or vector value with its physical unit

2. Brian will check the consistency of operations on units and raise an error for dimensionality mismatches

3. Most Brian functions will also complain about non-specified or incorrect units

Removing-units

1. Divide the value by its unit

   most of the time the recommended option because it is clear about the scale

2. Transform it to a pure numpy array in the base unit by calling asarray() (no copy) or array (copy)

3. Directly get the unitless value of a state variable by appending an underscore to the name

Constants

The brian2.units.constants package provides a range of physical constants that can be useful for detailed biological models. Brian provides the following constants