def _trans_from_params(param_info, params):
    do_rotate, do_translate, do_scale = param_info
    i = 0
    trans = []

    if do_rotate:
        x, y, z = params[:3]
        trans.append(rotation(x, y, z))
        i += 3

    if do_translate:
        x, y, z = params[i:i + 3]
        trans.insert(0, translation(x, y, z))
        i += 3

    if do_scale == 1:
        s = params[i]
        trans.append(scaling(s, s, s))
    elif do_scale == 3:
        x, y, z = params[i:i + 3]
        trans.append(scaling(x, y, z))

    trans = reduce(dot, trans)
    return trans
Convert transformation parameters into a transformation matrix
dataset/ETHPy150Open mne-tools/mne-python/mne/coreg.py/_trans_from_params