Variable class

(Shortest import: from brian2.core.variables import Variable)

class brian2.core.variables.Variable(name, dimensions=Dimension(), owner=None, dtype=None, scalar=False, constant=False, read_only=False, dynamic=False, array=False)[source]

Bases: brian2.utils.caching.CacheKey

An object providing information about model variables (including implicit variables such as t or xi). This class should never be instantiated outside of testing code, use one of its subclasses instead.

Attributes

`array`	Whether the variable is an array
`constant`	Whether the variable is constant during a run
`dim`	The variable’s dimensions.
`dtype`	The dtype used for storing the variable.
`dtype_str`	String representation of the numpy dtype
`dynamic`	Whether the variable is dynamically sized (only for non-scalars)
`is_boolean`
`is_integer`
`name`	The variable’s name.
`owner`	The `Group` to which this variable belongs.
`read_only`	Whether the variable is read-only
`scalar`	Whether the variable is a scalar
`unit`	The `Unit` of this variable

Methods

`get_addressable_value`(name, group)	Get the value (without units) of this variable in a form that can be indexed in the context of a group.
`get_addressable_value_with_unit`(name, group)	Get the value (with units) of this variable in a form that can be indexed in the context of a group.
`get_len`()	Get the length of the value associated with the variable or `0` for a scalar variable.
`get_value`()	Return the value associated with the variable (without units).
`get_value_with_unit`()	Return the value associated with the variable (with units).
`set_value`(value)	Set the value associated with the variable.

Details

array: Whether the variable is an array

constant: Whether the variable is constant during a run

dim: The variable’s dimensions.

dtype: The dtype used for storing the variable.

dtype_str: String representation of the numpy dtype

dynamic: Whether the variable is dynamically sized (only for non-scalars)

is_boolean

is_integer

name: The variable’s name.

owner: The Group to which this variable belongs.

read_only: Whether the variable is read-only

scalar: Whether the variable is a scalar

unit: The Unit of this variable

get_addressable_value(name, group)[source]: Get the value (without units) of this variable in a form that can be indexed in the context of a group. For example, if a postsynaptic variable x is accessed in a synapse S as S.x_post, the synaptic indexing scheme can be used.

get_addressable_value_with_unit(name, group)[source]: Get the value (with units) of this variable in a form that can be indexed in the context of a group. For example, if a postsynaptic variable x is accessed in a synapse S as S.x_post, the synaptic indexing scheme can be used.

get_len()[source]: Get the length of the value associated with the variable or 0 for a scalar variable.

get_value()[source]: Return the value associated with the variable (without units). This is the way variables are accessed in generated code.

get_value_with_unit()[source]: Return the value associated with the variable (with units).

set_value(value)[source]: Set the value associated with the variable.