How to use the index function from mathjs

solver.js

GitHub: truncatedAvocados/thesis-server

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let index;
let scale;
let col;

for (let j = 0; j < nCols; j += 1) {
  index = math.index(math.range(0, nCols), j);
  col = matrix.subset(index);
  scale = norm(col, p);

  if (scale > 0) {

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artifacter.js

GitHub: ep-infosec/50_google_x-amber

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  return {"frequencies": frequencies, "spectrum": spectrums};
}

getRelevantIndeces(minFreq, maxFreq, windowSize) {
  // Returns indeces in the frequency array bounded by minFreq and maxFreq
  return math.index(math.range(Math.ceil(minFreq*windowSize/this.SAMPLING_FREQ), Math.floor(maxFreq*windowSize/this.SAMPLING_FREQ), true));
}

getFFTBand(fft, minFreq, maxFreq, windowSize) {
  // get average power in the frequency bands bounded by minFreq and maxFreq

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cramer.js

GitHub: Phochara/Numerpro

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data["x"].push(
  math.round(
    math.det(
      math.subset(
        a,
        math.index(math.range(0, a.size()[0]), i),
        math.subset(b, math.index(math.range(0, a.size()[0]), 0))
      )
    )
  ) / math.round(math.det(a))

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optimization.js

GitHub: mljs/optimization

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* */
_toNormalVector : function(vect) {
    var normalVector = [];
    var size = math.subset(math.size(vect), math.index(1));
    for (var i = 0; i < size; ++i) {
        normalVector.push(math.subset(vect, math.index(0, i)));
    }
    return normalVector;
},

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+ 4 other calls in file