Epsilon : 1e-12
Linear array on nodes : Array<double> [
 + id             : const_val
 + size           : 9
 + nb_component   : 2
 + allocated size : 9
 + memory size    : 144.00Byte
 + values         : {{0, 0}, {13, 11}, {36, 18}, {23, 7}, {6.5, 5.5}, {24.5, 14.5}, {29.5, 12.5}, {11.5, 3.5}, {18, 9}}
]

Gradient on quad : 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}}
]

Node positions : Array<double> [
 + id             : mesh:coordinates
 + size           : 9
 + 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}}
]

Gradient of nodes : Array<double> [
 + id             : grad_coord_on_quad
 + size           : 16
 + nb_component   : 4
 + allocated size : 16
 + memory size    : 512.00Byte
 + values         : {{1, 1.11022e-16, 0, 1}, {1, 1.11022e-16, 0, 1}, {1, 0, 0, 1}, {1, 0, 0, 1}, {1, 0, 2.22045e-16, 1}, {1, 0, 1.11022e-16, 1}, {1, 0, 0, 1}, {1, 0, 1.11022e-16, 1}, {1, 5.55112e-17, 0, 1}, {1, 5.55112e-17, 0, 1}, {1, 0, 0, 1}, {1, 0, 0, 1}, {1, 0, 0, 1}, {1, 0, 0, 1}, {1, 0, 0, 1}, {1, 0, 0, 1}}
]