Suppose I have a matrix say
L=[[1,2],[3, 4]]
M=matrix(L)
then after a few operations M is transformed in N say
N = matrix([[10,12],[33,14]])
how can I obtain the list NN = [[10,12],[33,14]].
If know that N.coefficients() = N.list() = [10,12,33,14] but what I want is [[10,12],[33,14]].
