def arr_to_vector(arr):
    """Reshape a multidimensional array to a vector.
    """
    dim = array_dim(arr)
    tmp_arr = []
    for n in range(len(dim) - 1):
        for inner in arr:
            for i in inner:
                tmp_arr.append(i)
        arr = tmp_arr
        tmp_arr = []
    return arr
Reshape a multidimensional array to a vector.