code: function pivotArrays(arrays = []) {
                return (arrays.length)
                  ? arrays[ 0 ].map((vectorItem, index) => {
                    const returnArray = [];
                    arrays.forEach((v, i) => {
                      returnArray.push(arrays[ i ][ index ]);
                    });
                    return returnArray;
                  })
                  : arrays;
              }
docs: returns a matrix of values by combining arrays into a matrix
  @memberOf util
  @example
  const arrays = [
  [ 1, 1, 3, 3 ],
  [ 2, 2, 3, 3 ],
  [ 3, 3, 4, 3 ],
  ];
  pivotArrays(arrays); //=>
  [
  [1, 2, 3,],
  [1, 2, 3,],
  [3, 3, 4,],
  [3, 3, 3,],
  ];
  @param {Array} [vectors=[]] - array of arguments for columnArray to merge columns into a matrix
  @returns {Array} a matrix of column values