class rubin_sim.maf.metrics.NChangesMetric(col='filter', order_by='observationStartMJD', **kwargs)

Bases: BaseMetric

Compute the number of times a column value changes. (useful for filter changes in particular).

Methods Summary

run(data_slice[, slice_point])

Calculate metric values.

Methods Documentation

run(data_slice, slice_point=None)

Calculate metric values.


Values passed to metric by the slicer, which the metric will use to calculate metric values at each slice_point.

slice_pointdict or None

Dictionary of slice_point metadata passed to each metric. E.g. the ra/dec of the healpix pixel or opsim fieldId.

metricValue: int float or object

The metric value at each slice_point.