code: function printMatrix2 (m) {
    const tStr = m.elements.map(formatPrintNumber);
    const matrixString = `
    +-                -+
    | ${tStr[0]}  ${tStr[2]} |
    | ${tStr[1]}  ${tStr[3]} |
    +-                -+`;
    return matrixString;
  }
docs: Pretty prints a Matrix2.
  @memberof Utils
  @param {Matrix2} m The 2x2 matrix.
  @returns {string} The formatted string.