opennodex

Structural finite-element analysis from .ndx decks, from Python and the command line.

pip install opennodex brings everything a run needs: the .ndx compiler, the native nodex engine and the native nodex-mesher, built for your platform, plus Node.js (as a dependency wheel). Nothing else to install, no solver to configure.

pip install opennodex
opennodex selftest          # solves a beam and an auto-meshed slab

Command line

opennodex check viga.ndx               # compile only: positioned diagnostics
opennodex run viga.ndx                 # compile + solve, one summary line per solve
opennodex run viga.ndx --json r.json   # …and the full result
opennodex info                         # compiler, engine contract version, mesher

Python

import opennodex

out = opennodex.run("viga.ndx")        # a path, or the deck's text
for solve, result in zip(out["solves"], out["results"]):
    print(solve["kind"], len(result["nodes"]))

opennodex.check("viga.ndx")            # {"ok", "diagnostics", ...} — never raises for a bad deck

A deck looks like this:

model units kN, m
material steel E=210e6 nu=0.3 rho=7.85
section s A=0.00538 Iy=8.36e-5 Iz=6.04e-6 J=2.01e-7
node A at (0,0,0)
node B at (6,0,0)
beam B1 from A to B steel s div 4
fix A
load 1 nodal B fz=-10
solve linear_static

Every number comes from a real engine run. The deck carries its own section properties, so it runs the same on any machine.

Platforms

Linux x86_64 (glibc as tagged on the wheel), Windows x64, macOS (Apple Silicon and Intel). The desktop app (editor, 3D viewer and the optional agent) is a separate download: opennodex releases.

Español. pip install opennodex instala el compilador de .ndx, el motor nativo nodex y el mallador nativo para tu plataforma, más Node.js. opennodex selftest comprueba la instalación; opennodex run deck.ndx compila y resuelve. La aplicación de escritorio se descarga aparte.