openmc.lib.Tally

class openmc.lib.Tally(uid=None, new=True, index=None)

Tally stored internally.

This class exposes a tally that is stored internally in the OpenMC library. To obtain a view of a tally with a given ID, use the openmc.lib.tallies mapping.

Parameters

• uid (int or None) – Unique ID of the tally

• new (bool) – When index is None, this argument controls whether a new object is created or a view of an existing object is returned.

• index (int or None) – Index in the tallies array.

Variables

• id (int) – ID of the tally

• estimator (str) – Estimator type of tally (analog, tracklength, collision)

• filters (list) – List of tally filters

• mean (numpy.ndarray) – An array containing the sample mean for each bin

• multiply_density (bool) –

  Whether reaction rates should be multiplied by atom density

  New in version 0.14.0.

• nuclides (list of str) – List of nuclides to score results for

• num_realizations (int) – Number of realizations

• results (numpy.ndarray) – Array of tally results

• std_dev (numpy.ndarray) – An array containing the sample standard deviation for each bin

• type (str) – Type of tally (volume, mesh_surface, surface)

ci_width(alpha=0.05)

Confidence interval half-width based on a Student t distribution

Parameters

alpha (float) – Significance level (one minus the confidence level!)

Returns

Half-width of a two-sided (1 - \(alpha\)) confidence interval

Return type

float

find_filter(filter_type)

Returns the first instance of a filter matching the specified type

Parameters

filter_type (subclass of openmc.lib.Filter) – The filter type to match when retrieving a filter instance

Returns

filter – The filter instance matching the input filter type

Return type

openmc.lib.Filter

Raises

ValueError if a filter instance matching the input filter type cannot be found. –

reset()

Reset results and num_realizations of tally