code: public Matrix4x3f m01(float m01) {
          this.m01 = m01;
          properties &= ~PROPERTY_ORTHONORMAL;
          if (m01 != 0.0f)
              properties &= ~(PROPERTY_IDENTITY | PROPERTY_TRANSLATION);
          return this;
      }
docs: Set the value of the matrix element at column 0 and row 1.
  
  @param m01
  the new value
  @return this