mirror of https://github.com/Qiskit/qiskit.git
29 lines
1.3 KiB
YAML
29 lines
1.3 KiB
YAML
---
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upgrade:
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- |
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The :func:`~.marginal_counts` function when called with a :class:`~.Result`
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object input, will now marginalize the ``memory`` field of experiment data
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if it's set in the input :class:`~.Result`. Previously, the ``memory`` field
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in the the input was not marginalized. This change was made because the previous
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behavior would result in the ``counts`` field not matching the ``memory``
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field after :func:`~.marginal_counts` was called. If the previous behavior
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is desired it can be restored by setting ``marginalize_memory=None`` as
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an argument to :func:`~.marginal_counts` which will not marginalize the
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``memory`` field.
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features:
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- |
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The :func:`~.marginal_counts` function now supports marginalizing the
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``memory`` field of an input :class:`~.Result` object. For example, if
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the input ``result`` argument is a qiskit :class:`~.Result` object
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obtained from a 4-qubit measurement we can marginalize onto the first qubit
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with::
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print(result.results[0].data.memory)
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marginal_result = marginal_counts(result, [0])
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print(marginal_result.results[0].data.memory)
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The output is::
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['0x0', '0x1', '0x2', '0x3', '0x4', '0x5', '0x6', '0x7']
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['0x0', '0x1', '0x0', '0x1', '0x0', '0x1', '0x0', '0x1']
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