A matrix is transmitted by sending the columns as a sequence of vectors.
i1 : R = ZZ/101[x,y,z];
i2 : f = matrix ( R, {{11,0,33},{0,22,34}} ) o2 = {0} | 11 0 33 | {0} | 0 22 34 | 2 3 o2 : Matrix R <--- R
i3 : ascii sendgg(ggPush f, ggtonet) o3 = {3, 1, 0, 0, 11, 1, 1, 0, 22, 2, 1, 0, 34, 0, 0, 33} o3 : List
See also transmitting a vector.