How to use the sparse function from mathjs

co2eq.js

GitHub: larssbr/electricitymap

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//   - sum_j_export(v_ij) * x_i
// Note that exports cancel out.

// We wish to solve Ax = b
var n = validCountries.length;
var A = mathjs.sparse().resize([n, n]);
var b = mathjs.zeros(n);

validCountries.forEach(function (country, i) {
    A.set([i, i], country.totalProduction + country.totalImport);

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+ 4 other calls in file

Retrieval.js

GitHub: zjohn77/retrieval

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                                                  K = this.K,
          B = this.B
         );

// Create a sparse matrix with initial data and the 'number' datatype.
this.docIndex = math.sparse(bm25.buildMatr(), 
                                                                         'number'
                                                                        );

// Create a reverse index for fast keyword search.

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Retrieval.js

GitHub: hxnyk/retrieval

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let bm25 = new Bm25(corpusMatr = this.docArray.map(chunkFilterStem),
                    K = this.K,
                    B = this.B);

// Creates a sparse matrix with initial data; number datatype.
this.docIndex = math.sparse(bm25.buildMatr(), 'number');

// Creates a reverse index for fast keyword search.
this.termIndex = bm25.getTerms();
};

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day20-02.js

GitHub: Insood/AdventOfCode

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function load_image(raw_image, padding){
  let rows = raw_image.split("\r\n");
  let column_count = rows[0].length;

  let matrix = math.sparse();
  matrix.resize([column_count + 2*padding, rows.length + 2*padding], false);

  for(let x = 0; x < rows.length; x++){
    let row = rows[x];

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+ 5 other calls in file