bertrandbev / nlopt-js Goto Github PK

Hi! Super exciting package here! It could be really enabling for some of our efforts to do scientific computing in the browser. I've installed the version on npm and I have it working in the browser, but I'm having trouble using the same distribution from npm in node.

when i run the following in node v14.7.0

const nlopt = require('nlopt-js')

(async () => {
  await nlopt.ready
  const opt = new nlopt.Optimize(nlopt.Algorithm.LD_SLSQP, 2);
  opt.setMinObjective((x, grad) => {
    if (grad) {
      grad[0] = 0;
      grad[1] = 0.5 / Math.sqrt(x[1]);
    }
    return Math.sqrt(x[1]);
  }, 1e-4);
  const res = opt.optimize([1, 6]);
  nlopt.GC.flush();
})()

I get the error

TypeError: require(...) is not a function

The import itself works, i.e. if I just try to run

const nlopt = require('nlopt-js')
console.log(nlopt)

I get

{
  GC: [class D] { objects: Set(0) {}, whitelist: A { _data: {}, size: 0 } },
  ready: Promise { <pending> }
}

So something is working! But if I run the actual example, I get the error above.

Maybe something went wrong with the dist version published to npm? Again, it does work in the browser!

Thanks for any ideas or help. I might also try rebuilding myself.

Hey there,

This looks like a cool project!

I'm trying to use it in a web-based react app. I'm having some trouble importing it, so I've been trying to build your demo to see if I can get it working.

However, yarn fails saying dependencies not found.

I notice in your vue.config.js there is the line
config.resolve.alias.set('@nlopt', path.resolve(__dirname, '../dist/index.js'))

Do you happen to have any tips for how to go about creating this dist/index.js?

Thanks!

In the nlopt documentation there's a function set_xtol_rel which sets the overall solver tolerance to error, which is an important config parameter. But looking at the code here that function seems to be missing. Could it be added?