Home Developers CVP Evidence Reproduce

CVP reproduce

mechanical.statics.cantilever_load_at_deflection

Independent re-run pack: fixed input vectors, O3 expected values, oracle version, commands, and the last result summary. This is how a reader moves from “CalculatorX says it passed” to “I can reproduce why it passed.”

Identity

Calculation version, protocol version, and evidence revision are distinct.

Calculation version
1.0.0
CVP protocol
1.0.0-proposed · proposed
Evidence revision
2026-09-27.o2-o3
Oracle
O3 · mpmath 1.4.1 · 80 dps
Generator
cantilever-load-at-mpmath-o3 · seed 20260927.cantilever-load-at-o3
Table SHA-256
e7d0a8e391a873cf4cf2d5eb3d8b1055e9fdf525927f8826d6db567074303cfd

Numerical claim

O3 PASS is a tabulated-vector claim, not a whole-domain proof.

O2: delta vs a separate-module identity (≤2 ULP). Not tip-only under the same intermediate load, and not a simply supported span. ≤2 ULP vs O3 applies only to the published tabulated cantilever-load-at vectors.

  • Last O3 run 8 / 8
  • Max error observed 2 ULP
  • Threshold ≤ 2 ULP

Commands

Regenerate the table from the public generator. Independent REST check needs only this page's reproduce.json plus stdlib Python — no repo clone and no mpmath. The CVP runner remains a maintainer command.

Regenerate O3 table
python3 generate-cantilever-load-at-o3.py after downloading the public generator next to the table
Repo maintainer path
python3 scripts/lib/cvp/oracles/generate-cantilever-load-at-o3.py
Independent REST check
Compare POST /api/v1/calc/cantilever-load-at against /developers/cvp/reproduce/cantilever-load-at-o3-tables.json after downloading check-math-o3-rest.py next to cantilever-load-at-o3-tables.json (or pass --reproduce reproduce.json)
Re-run CVP
npm run cvp:run -- --capability mechanical.statics.cantilever_load_at_deflection
REST check
POST https://www.calculatorx.com/api/v1/calc/cantilever-load-at with a tabulated input from the table below

Re-running the generator without changing seed or inputs should reproduce table SHA-256 e7d0a8e391a873cf4cf2d5eb3d8b1055e9fdf525927f8826d6db567074303cfd. Compare each expected_f64 to the production result within the declared ULP threshold.

Tabulated vectors

Every O3 vector used for the ≤2 ULP claim. Expected values come from the published mpmath table, not from the implementation under test.

IDKindInputsExpected (f64)ActualULPStatus
o3-checkcheck{"P":"48","a":"1","x":"2","L":"2","E":"1","I":"1"}{"oracle_layer":"analytic","delta":40,"P":48,"a":1,"x":2,"L":2,"E":1,"I":1}{"model":"cantilever_load_at_deflection","P":48,"a":1,"x":2,"L":2,"E":1,"I":1,"delta":40,"solver":"cantilever intermediate load at a station","convention":"Cantilever fixed at one end with one concentrated load at distance a from the fixed end. Deflection at distance x from the wall uses the two-piece elastic curve. Positive P is the positive deflection direction. I is an input. x = a is the deflection at the load. x = L is the free-end page."}0PASS
o3-SISI{"P":"1000","a":"1","x":"2","L":"2","E":"200000000000","I":"0.00001"}{"oracle_layer":"analytic","delta":0.0004166666666666667,"P":1000,"a":1,"x":2,"L":2,"E":200000000000,"I":0.00001}{"model":"cantilever_load_at_deflection","P":1000,"a":1,"x":2,"L":2,"E":200000000000,"I":0.00001,"delta":0.0004166666666666666,"solver":"cantilever intermediate load at a station","convention":"Cantilever fixed at one end with one concentrated load at distance a from the fixed end. Deflection at distance x from the wall uses the two-piece elastic curve. Positive P is the positive deflection direction. I is an input. x = a is the deflection at the load. x = L is the free-end page."}2PASS
o3-aliasalias{"load":"96","span":"2","modulus":"1","Ix":"1","a":"1","x":"2"}{"oracle_layer":"analytic","delta":80,"P":96,"a":1,"x":2,"L":2,"E":1,"I":1}{"model":"cantilever_load_at_deflection","P":96,"a":1,"x":2,"L":2,"E":1,"I":1,"delta":80,"solver":"cantilever intermediate load at a station","convention":"Cantilever fixed at one end with one concentrated load at distance a from the fixed end. Deflection at distance x from the wall uses the two-piece elastic curve. Positive P is the positive deflection direction. I is an input. x = a is the deflection at the load. x = L is the free-end page."}0PASS
o3-awkwardawkward{"P":"13.7","a":"1.2","x":"1.5","L":"2","E":"210000","I":"0.83"}{"oracle_layer":"analytic","delta":0.0000622512908777969,"P":13.7,"a":1.2,"x":1.5,"L":2,"E":210000,"I":0.83}{"model":"cantilever_load_at_deflection","P":13.7,"a":1.2,"x":1.5,"L":2,"E":210000,"I":0.83,"delta":0.00006225129087779689,"solver":"cantilever intermediate load at a station","convention":"Cantilever fixed at one end with one concentrated load at distance a from the fixed end. Deflection at distance x from the wall uses the two-piece elastic curve. Positive P is the positive deflection direction. I is an input. x = a is the deflection at the load. x = L is the free-end page."}1PASS
o3-negsigned{"P":"-48","a":"1","x":"2","L":"2","E":"1","I":"1"}{"oracle_layer":"analytic","delta":-40,"P":-48,"a":1,"x":2,"L":2,"E":1,"I":1}{"model":"cantilever_load_at_deflection","P":-48,"a":1,"x":2,"L":2,"E":1,"I":1,"delta":-40,"solver":"cantilever intermediate load at a station","convention":"Cantilever fixed at one end with one concentrated load at distance a from the fixed end. Deflection at distance x from the wall uses the two-piece elastic curve. Positive P is the positive deflection direction. I is an input. x = a is the deflection at the load. x = L is the free-end page."}0PASS
o3-smallsmall{"P":"10","a":"0.5","x":"1","L":"2","E":"1000","I":"0.01"}{"oracle_layer":"analytic","delta":0.10416666666666667,"P":10,"a":0.5,"x":1,"L":2,"E":1000,"I":0.01}{"model":"cantilever_load_at_deflection","P":10,"a":0.5,"x":1,"L":2,"E":1000,"I":0.01,"delta":0.10416666666666667,"solver":"cantilever intermediate load at a station","convention":"Cantilever fixed at one end with one concentrated load at distance a from the fixed end. Deflection at distance x from the wall uses the two-piece elastic curve. Positive P is the positive deflection direction. I is an input. x = a is the deflection at the load. x = L is the free-end page."}0PASS
o3-stiffstiff{"P":"500","a":"1","x":"2","L":"2","E":"210e9","I":"2e-4"}{"oracle_layer":"analytic","delta":0.00000992063492063492,"P":500,"a":1,"x":2,"L":2,"E":210000000000,"I":0.0002}{"model":"cantilever_load_at_deflection","P":500,"a":1,"x":2,"L":2,"E":210000000000,"I":0.0002,"delta":0.00000992063492063492,"solver":"cantilever intermediate load at a station","convention":"Cantilever fixed at one end with one concentrated load at distance a from the fixed end. Deflection at distance x from the wall uses the two-piece elastic curve. Positive P is the positive deflection direction. I is an input. x = a is the deflection at the load. x = L is the free-end page."}0PASS
o3-longlong{"P":"200","a":"1","x":"2","L":"4","E":"70e9","I":"5e-5"}{"oracle_layer":"analytic","delta":0.00004761904761904762,"P":200,"a":1,"x":2,"L":4,"E":70000000000,"I":0.00005}{"model":"cantilever_load_at_deflection","P":200,"a":1,"x":2,"L":4,"E":70000000000,"I":0.00005,"delta":0.00004761904761904762,"solver":"cantilever intermediate load at a station","convention":"Cantilever fixed at one end with one concentrated load at distance a from the fixed end. Deflection at distance x from the wall uses the two-piece elastic curve. Positive P is the positive deflection direction. I is an input. x = a is the deflection at the load. x = L is the free-end page."}0PASS