refactor: reorganize backend modules into sub-packages for models, data, visualization, wafer, and controllers

src/pygui/backend/models/frame_stats.py

@@ -0,0 +1,37 @@
+"""Per-frame descriptive statistics"""
+
+from __future__ import annotations
+import math
+from dataclasses import dataclass
+
+
+@dataclass(frozen=True)
+class Stats:
+    min: float; min_index: int
+    max: float; max_index: int
+    diff: float; avg: float
+    sigma: float; three_sigma: float
+
+
+def compute_stats(values: list[float]) -> Stats:
+    clean = [(i, v) for i, v in enumerate(values) if not math.isnan(v)]
+    if not clean:
+        return Stats(0.0, -1, 0.0, -1, 0.0, 0.0, 0.0, 0.0)
+
+    min_index, min_v = min(clean, key=lambda iv: iv[1])
+    max_index, max_v = max(clean, key=lambda iv: iv[1])
+    nums = [v for _, v in clean]
+    avg = sum(nums) / len(nums)
+    variance = sum((v - avg) ** 2 for v in nums) / len(nums)
+    sigma = math.sqrt(variance)
+
+    return Stats(
+        min=min_v,
+        min_index=min_index,
+        max=max_v,
+        max_index=max_index,
+        diff=max_v - min_v,
+        avg=avg,
+        sigma=sigma,
+        three_sigma=3 * sigma,
+    )