Matrix output of "Iterate" node

Created by: elfnor

The new "Iterate" or "Iterate matrix transform" node would be more consistent with other nodes such as "Matrix Interpolation" if it only had a Matrix and number of iterations as inputs and a list of powers of the input matrix as ouput. It would also, I think, calculate faster.

I quickly wrote up a "Scripted Node" to show this. Sorry I havn't looked at writing full nodes yet.

from mathutils import Matrix
from sverchok.data_structure import Matrix_listing


id_matrix = [[[1.0, 0.0, 0.0, 0.0],
             [0.0, 1.0, 0.0, 0.0],
             [0.0, 0.0, 1.0, 0.0],
             [0.0, 0.0, 0.0, 1.0]]]

def sv_main(mat1=id_matrix, pows = 1):

    in_sockets = [
        ['m', 'Matrix',  mat1],
        ['s', 'powers', pows]
    ]

    mat_in = Matrix(mat1[0])
    result = Matrix(id_matrix[0])

    mat_list = []
    mat_list.append(result)

    for i in range(pows):
        result = result * mat_in
        mat_list.append(result)   

    mat_out =  Matrix_listing(mat_list)

    out_sockets = [
        ['m', 'Mat out', mat_out]
    ]

    return in_sockets, out_sockets

It produces the same output (as separate objects) as this: