The ExtraMath feature is a library that organizes simple mathematical formulas frequently used in the use cases of WelsonJS.
Currently, it supports the following:
Below is an example of utilizing DTM (Document-Term Matrix) and Cosine Similarity using the WelsonJS framework.
var ExtraMath = require("lib/extramath");
var a = "this is an apple";
var b = "this is red apple";
var dtm = new ExtraMath.DTM();
dtm.add(a);
dtm.add(b);
var mat = dtm.toArray();
console.log("Original sentance");
console.log(a);
console.log(b);
console.log("Create a DTM(Document-Term Matrix)");
console.log(mat[0].join(' '));
console.log(mat[1].join(' '));
console.log("Measure Cosine Similarity");
console.log('' + ExtraMath.arrayCos(mat[0], mat[1]));
console.log('' + ExtraMath.measureSimilarity(a, b));You can also find this example in the testloader.js file.