code: public Matrix4x3f m00(float m00) {
          this.m00 = m00;
          properties &= ~PROPERTY_ORTHONORMAL;
          if (m00 != 1.0f)
              properties &= ~(PROPERTY_IDENTITY | PROPERTY_TRANSLATION);
          return this;
      }
docs: Set the value of the matrix element at column 0 and row 0.
  
  @param m00
  the new value
  @return this