group_min

group_min(frame, group, name=None, metadata=None)

Replace each element with its row-wise group minimum.

Parameters

frame : Panel | Graph

Input numeric Panel or single-output Graph. group : Panel | Graph

Matching CategoryPanel containing row-wise group labels. name : str | None, default None

Optional graph-node name. A generated name is used when omitted. metadata : Mapping[str, Any] | None, default None

Optional metadata stored on the graph node.

Returns

Graph

Lazy single-output graph. Call .compute() to materialize a Panel.

Examples

import pandas as pd

from bagelquant_core import CategoryPanel, Domain, Panel
from bagelquant_core.composer import group_min

domain = Domain(calendar=pd.to_datetime(["2024-01-02"]), universe=["a", "b", "c"])
factor = Panel.from_domain(pd.DataFrame({"a": [1.0], "b": [3.0], "c": [8.0]}, index=domain.sessions), domain)
industry = CategoryPanel.from_domain(pd.DataFrame({"a": ["tech"], "b": ["tech"], "c": ["bank"]}, index=domain.sessions), domain)

result = group_min(factor, industry).compute().data
print(result)

Notes

Inputs are aligned by index and columns before the operation runs.

Missing group labels are excluded from the group calculation.