-------- bicgstab() -------
  |A*x-b|/|b| = 4.97367e-05
  history = [ 1 0.4513 1.60752 0.108491 0.0379676 0.011765 0.00958063 0.00847243 0.00931855 0.00127366 0.00110497 0.000371644 0.000362132 0.000269913 0.000223167 0.000212457 0.000279266 4.97367e-05 ] (18)

--------- gmres() ---------
  |A*x-b|/|b| = 0.000400246
  history = [ 0.893465 0.0607599 0.0262138 0.0099447 0.00348539 0.0011249 0.000349895 0.000106706 3.01123e-05 ] (9)


