code: public Matrix4f m23(float m23) {
          this.m23 = m23;
          if (m23 != 0.0f)
              properties &= ~(PROPERTY_IDENTITY | PROPERTY_AFFINE | PROPERTY_TRANSLATION | PROPERTY_ORTHONORMAL);
          return this;
      }
docs: Set the value of the matrix element at column 2 and row 3.
  
  @param m23
  the new value
  @return this