Matplotlibでグラフの中に棒線を表示させたい。

前提・実現したいこと

plt.show()でグラフの中に棒線を表示させたい。

発生している問題・エラーメッセージ

エラーメッセージは出てきませんが、plt.show()で表示したグラフに線が表示されません。（縦軸、横軸の目盛りは表示されるのですが、線が表示されず、中が真っ白の状態。）

python
1
2#日本の１０年ごとの人口推移を計算して図示していくプログラム
3
4import numpy as np
5
6import matplotlib.pyplot as plt
7
8
9
10A = np.array([[0.0,  0.02, 0.26,  0.32, 0.02, 0.0, 0.0, 0.0, 0.0, 0.0],\
11              [1.0, 0.0,  0.0,  0.0, 0.0, 0.0 ,0.0 ,0.0 ,0.0,0.0],\
12              [0.0, 0.98,  0.0,  0.0, 0.0, 0.0, 0.0 ,0.0, 0.0 ,0.0],\
13              [0.0,  0.0,  0.98, 0.0, 0.0 ,0.0 , 0.0, 0.0, 0.0 ,0.0],\
14              [0.0 , 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ],\
15              [0.0, 0.0 ,0.0 ,0.0 ,0.98 ,0.0 ,0.0 ,0.0 ,0.0 ,0.0 ],\
16              [0.0 ,0.0 ,0.0 ,0.0 ,0.0 ,0.96, 0.0 ,0.0 ,0.0 ,0.0 ],\
17              [0.0 ,0.0 ,0.0 ,0.0 ,0.0 ,0.0 ,0.88, 0.0 ,0.0 ,0.0 ],\
18              [0.0 ,0.0 ,0.0 ,0.0 ,0.0 ,0.0 ,0.0 ,0.69 ,0.0 ,0.0],\
19              [0.0 ,0.0 ,0.0 ,0.0 ,0.0 ,0.0 ,0.0 ,0.0 ,0.34 ,0.0]])
20
21X = np.array([[ 105],\
22              [ 117],\
23              [ 127],\
24              [ 163],\
25              [ 178],\
26              [ 153],\
27              [ 183],\
28              [ 138],\
29              [ 77],\
30              [ 16]])
31
32N = 10
33
34age=[[0,10,20,30,40,50,60,70,80,90]]
35
36
37
38np.set_printoptions(precision=8, floatmode='fixed')
39
40for i in range(1, N+1):
41    X = A.dot(X)
42    print("20{0}3年は\n{1}\n".format(i+1, X))#2100からバグるがめんどいので放置。
43
44    """ここからグラフ描写 (Xを転置行列にしたい)"""
45
46    a=input("グラフを描写しますか？Y/N:")
47    if a=="Y" or "y":
48
49        X2=X.T#Xの転置行列
50        
51        plt.plot(X2,age)
52        plt.xlabel("population")
53        plt.ylabel("age")
54        if i<8:
55            plt.title("20{}3年の人口推移" .format(i+1))
56        else:
57            plt.title("21{}3の人口推移".format(i-9))
58
59        plt.show()
60
61    else:
62        continue
63