Validate performance of multipy method from numbers.js

[vkostyukov]

I've found this implementation in numbers.js library. Here is the code:

if (arrA[0].length === arrB.length) {
  var result = new Array(arrA.length);

for (var x = 0; x < arrA.length; x++) {
  result[x] = new Array(arrB[0].length);
}

var arrB_T = transpose(arrB);

for (var i = 0; i < result.length; i++) {
  for (var j = 0; j < result[i].length; j++) {
    result[i][j] = dotproduct(arrA[i],arrB_T[j]);
  }
}
return result;

} else {
throw new Error("Array mismatch");
}

Probabbly, it works faster than current implementation.

[yuronew]

Is it still actual?

[vkostyukov]

There is a pull-request with details: #55

[vkostyukov]

This approach requires fetching the ith row/column of the matrix which is alwasy a fat operation, sinc it involves the full copying. I don't see a strong reason of keeping an eye on this issue.