code: function pivotVector(vectors=[]) {
                return vectors.reduce((result, val, index/*, arr*/) => {
                  val.forEach((vecVal, i) => {
                    (index === 0)
                      ? (result.push([vecVal, ]))
                      : (result[ i ].push(vecVal));
                  });
                  return result;
                }, []);
              }
docs: returns an array of vectors as an array of arrays
  @example
  const vectors = [ [1,2,3], [1,2,3], [3,3,4], [3,3,3] ];
  const arrays = pivotVector(vectors); // => [ [1,2,3,3], [2,2,3,3], [3,3,4,3] ];
  @memberOf util
  @param {Array[]} vectors
  @returns {Array[]}