code: public Matrix3x2d set(double m00, double m01, 
                            double m10, double m11, 
                            double m20, double m21) {
          this.m00 = m00;
          this.m01 = m01;
          this.m10 = m10;
          this.m11 = m11;
          this.m20 = m20;
          this.m21 = m21;
          return this;
      }
docs: Set the values within this matrix to the supplied double values. The result looks like this:
  <p>
  m00, m10, m20<br>
  m01, m11, m21<br>
  
  @param m00
  the new value of m00
  @param m01
  the new value of m01
  @param m10
  the new value of m10
  @param m11
  the new value of m11
  @param m20
  the new value of m20
  @param m21
  the new value of m21
  @return this