Epsilon : 1e-12
FEEngine [
 + id                : my_fem
 + element dimension : 2
 + mesh [
  Mesh [
   + id                : mesh
   + spatial dimension : 2
   + nodes [
    Array<double> [
     + id             : mesh:coordinates
     + size           : 13
     + nb_component   : 2
     + allocated size : 2000
     + memory size    : 31.25KiByte
     + values         : {{0, 0}, {1, 0}, {1, 1}, {0, 1}, {0.5, 0}, {1, 0.5}, {0.5, 1}, {0, 0.5}, {0.5, 0.5}, {0.25, 0.75}, {0.75, 0.75}, {0.75, 0.25}, {0.25, 0.25}}
    ]
   + connectivities [
    ElementTypeMapArray<unsigned int> [
        (not_ghost:_point_1) [
       Array<unsigned int> [
        + id             : mesh:connectivities:_point_1
        + size           : 4
        + nb_component   : 1
        + allocated size : 2000
        + memory size    : 7.81KiByte
        + values         : {{0}, {1}, {2}, {3}}
       ]
         ]
        (not_ghost:_segment_2) [
       Array<unsigned int> [
        + id             : mesh:connectivities:_segment_2
        + size           : 8
        + nb_component   : 2
        + allocated size : 2000
        + memory size    : 15.62KiByte
        + values         : {{0, 4}, {4, 1}, {1, 5}, {5, 2}, {2, 6}, {6, 3}, {3, 7}, {7, 0}}
       ]
         ]
        (not_ghost:_triangle_3) [
       Array<unsigned int> [
        + id             : mesh:connectivities:_triangle_3
        + size           : 16
        + nb_component   : 3
        + allocated size : 2000
        + memory size    : 23.44KiByte
        + values         : {{3, 9, 6}, {0, 12, 7}, {2, 10, 5}, {1, 11, 4}, {7, 8, 9}, {6, 9, 8}, {6, 8, 10}, {7, 12, 8}, {5, 10, 8}, {4, 8, 12}, {4, 11, 8}, {5, 8, 11}, {0, 4, 12}, {3, 7, 9}, {1, 5, 11}, {2, 6, 10}}
       ]
         ]
    ]
   ]
   GroupManager [
   ]
  ]
 ]
]

Array<double> [
 + id             : grad_on_quad
 + size           : 16
 + nb_component   : 4
 + allocated size : 16
 + memory size    : 512.00Byte
 + values         : {{13, 11, 23, 7}, {13, 11, 23, 7}, {13, 11, 23, 7}, {13, 11, 23, 7}, {13, 11, 23, 7}, {13, 11, 23, 7}, {13, 11, 23, 7}, {13, 11, 23, 7}, {13, 11, 23, 7}, {13, 11, 23, 7}, {13, 11, 23, 7}, {13, 11, 23, 7}, {13, 11, 23, 7}, {13, 11, 23, 7}, {13, 11, 23, 7}, {13, 11, 23, 7}}
]