#!/usr/bin/env python
# -*- coding: utf-8 -*-
import numpy as np
import scipy as sp
import math
l_fifo = 4
dim = 2
start = 0
l_fill = 0
fifo_res = np.full((l_fifo, dim), np.NaN)
#push
for i in range(9):
    x = np.array([1.0 + i, 2.0])
    if l_fill >= l_fifo:
        start = start + 1
    else:
        l_fill = l_fill + 1 
    let_pos = (start + l_fill - 1) % l_fifo
    fifo_res[let_pos, :] = x
    print start, l_fill
    print fifo_res
    print "---------------------------"