code: function transpose(out, a) {
    // If we are transposing ourselves we can skip a few steps but have to cache some values
    if (out === a) {
      var a1 = a[1]
      out[1] = a[2]
      out[2] = a1
    } else {
      out[0] = a[0]
      out[1] = a[2]
      out[2] = a[1]
      out[3] = a[3]
    }
  
    return out
  }
docs: Transpose the values of a mat2
  
  @alias mat2.transpose
  @param {mat2} out the receiving matrix
  @param {mat2} a the source matrix
  @returns {mat2} out