tool: independent verifier - recomputes every answer from explicit params

verify.py

@@ -0,0 +1,15 @@
+#!/usr/bin/env python3
+"""verify.py - recompute every answer from explicit params. Exit 1 on any failure."""
+import json, sys
+rows = json.load(open("data/problems.json"))
+bad = 0
+for r in rows:
+    p = r["params"]
+    if r["topic"] == "kinematics":
+        if abs(p["v0"]*p["t"] + 0.5*p["a"]*p["t"]**2 - r["answer"]) > 0.05: bad += 1
+    elif r["topic"] == "energy":
+        if abs(p["m"]*p["g"]*p["h"] - r["answer"]) > 0.5: bad += 1
+    elif r["topic"] == "circuits":
+        if abs(p["v"]/(p["r1"]*p["r2"]/(p["r1"]+p["r2"])) - r["answer"]) > 0.01: bad += 1
+print("verified %d/%d" % (len(rows)-bad, len(rows)))
+sys.exit(1 if bad else 0)