学習環境
- Surface
- Windows 10 Pro (OS)
- Nebo(Windows アプリ)
- iPad
- MyScript Nebo - MyScript(iPad アプリ(iOS))
- 参考書籍
代数への出発 (新装版 数学入門シリーズ) (松坂 和夫(著)、岩波書店)の第6章(1次方程式、2次方程式)、4(2次関数のグラフ)の問9、10の解答を求めてみる。
軸の方程式。
頂点。
コード
#!/usr/bin/env python3
from unittest import TestCase, main
from sympy import symbols, plot
print('9, 10.')
x = symbols('x')
ys = [x ** 2 / 2 - 2,
-2 * (x + 2) ** 2,
(x + 2) ** 2 + 1,
-(x - 3) ** 2 / 2 + 4]
class Test(TestCase):
def test9(self):
y = (x - 2) ** 2 - 1
self.assertEqual(y.subs({x: 0}), 3)
self.assertEqual(y.subs({x: 1}), 0)
self.assertEqual(y.subs({x: 3}), 0)
p = plot(*ys,
(x, -10, 10),
ylim=(-10, 10),
legend=True,
show=False)
colors = ['red', 'green', 'blue', 'brown', 'orange',
'purple', 'pink', 'gray', 'skyblue', 'yellow']
for o, color in zip(p, colors):
o.line_color = color
p.show()
p.save('sample10.png')
if __name__ == "__main__":
main()
入出力結果(Zsh、PowerShell、Terminal、Jupyter(IPython))
% ./sample9.py -v
9, 10.
/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/sympy/plotting/plot.py:1065: MatplotlibDeprecationWarning:
The set_smart_bounds function was deprecated in Matplotlib 3.2 and will be removed two minor releases later.
self.ax[i].spines['left'].set_smart_bounds(True)
/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/sympy/plotting/plot.py:1066: MatplotlibDeprecationWarning:
The set_smart_bounds function was deprecated in Matplotlib 3.2 and will be removed two minor releases later.
self.ax[i].spines['bottom'].set_smart_bounds(False)
test9 (__main__.Test) ... ok
----------------------------------------------------------------------
Ran 1 test in 0.002s
OK
%
0 コメント:
コメントを投稿