samples groups
      A      1
      B      1
      C      1
      D      2
      E      2
      F      2
      G      3
      H      3
      I      3

B <- (-0.37670272 , 2.44136463, -0.79533912, -0.05487747,  0.25014132,  0.61824329 -0.17262350 ,-2.22390027, -1.26361438)

samples groups           B
      A      1 -0.37670272
      B      1  2.44136463
      C      1 -0.79533912
      D      2 -0.05487747
      E      2  0.25014132
      F      2  0.61824329
      G      3 -0.17262350
      H      3 -2.22390027
      I      3 -1.26361438

model.matrix( ~ 0 + groups + B)