time_reverse_pwc

Graph.time_reverse_pwc(pwc, *, name=None)

Reverse in time a piecewise-constant function.

Parameters

  • pwc (Pwc) – The piecewise-constant function v(t)v(t) to reverse.
  • name (str or None , optional) – The name of the node.

Returns

The piecewise-constant function w(t)w(t) defined by w(t)=v(τ−t)w(t)=v(\tau-t) for 0≤t≤τ0\leq t\leq \tau, where τ\tau is the duration of v(t)v(t).

Return type

Pwc

SEE ALSO

Graph.symmetrize_pwc : Symmetrize Pwcs.

Graph.time_concatenate_pwc : Concatenate Pwcs in time.

Notes

For more information on Pwc nodes see the Working with time-dependent functions in Boulder Opal topic.

Examples

Reverse a piecewise constant function.

>>> x = graph.pwc(durations=np.array([0.1, 0.5, 0.3]), values=np.array([1, 2, 3]))
>>> graph.time_reverse_pwc(x, name="reverse")
<Pwc: name="reverse", operation_name="time_reverse_pwc", value_shape=(), batch_shape=()>
>>> result = bo.execute_graph(graph=graph, output_node_names="reverse")
>>> result["output"]["reverse"]
{
    'durations': array([0.3, 0.5, 0.1]),
    'values': array([3., 2., 1.]),
    'time_dimension': 0
}

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