D2xdt2Min

class cubie.outputhandling.summarymetrics.d2xdt2_min.D2xdt2Min(precision)

Bases: SummaryMetric

Summary metric that tracks minimum second derivative values.

Notes

Uses three buffer slots: buffer[0] for previous value, buffer[1] for previous-previous value, and buffer[2] for minimum unscaled second derivative. The derivative is computed using central differences and scaled by sample_summaries_every² in the save function.

__init__(precision) → None

Initialise the D2xdt2Min summary metric.

build() → MetricFuncCache

Generate CUDA device functions for minimum second derivative.

Returns:

Cache containing the device update and save callbacks.

Return type:

MetricFuncCache

Notes

The update callback computes central finite differences and tracks the minimum unscaled second derivative. The save callback scales by sample_summaries_every² and resets the buffers.