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I have been been trying to use Kalman.js in a simple node application, but I struggling to resolve the error 'TypeError: Cannot read property 'multiply' of undefined'. I am using Sylvester. I have looked at issue #1 which used math and part of the resolution was a recommendation to use Sylvester.

I rewrote the math code using Sylvester and it gives the same error about A.multipy.

My adapted code is from issue 1 is:

const Kalman = require('kalman');
const sylvester = require('sylvester');

let valx = [ 4, 5 ];
let valp = $M([[ 5, 0 ], [ 0, 4 ]]);

var valr = [];
var vala = $M([[ 5, 0 ], [ 0, 4 ]]);
valr['A'] = vala;

let kf = new Kalman.KF(valx, valp);
kf.update(valr);

Running this gives: TypeError: Cannot read property 'multiply' of undefined
at KF.update (C:\Users\david\source\repos\sharesApr2020\NodeJS\nodeApp\node_modules\kalman\kalman.js:75:36).

I am probably missing something simple. Do you have any suggestions?

Hello!

This example filters use only longitude and latitude, but not altitude

Can you help me to modify function?

Thanks

I've got installed the kalman library through the NPM and try to start my code:

var kalman = require('kalman');
var math = require('mathjs');

let valx = [ 4, 5 ];
let valp = math.matrix([[ 5, 0 ], [ 0, 4 ]]);

var valr = [];
var vala = math.matrix([[ 5, 0 ], [ 0, 4 ]]);
valr['A'] = vala;

let kf = new kalman.KF(valx, valp);

kf.update(valr);

After start found the error:
Wondering what's wrong, thanks.

kalman.js:75
var xhat = A.multiply(x).add(B.multiply(u));
^

TypeError: A.multiply is not a function
at KF.update (...kalman.js:75:18)
at Object. (...index2.js:21:4)
at Module._compile (module.js:653:30)
at Object.Module._extensions..js (module.js:664:10)
at Module.load (module.js:566:32)
at tryModuleLoad (module.js:506:12)
at Function.Module._load (module.js:498:3)
at Function.Module.runMain (module.js:694:10)
at startup (bootstrap_node.js:204:16)
at bootstrap_node.js:625:3