学習環境
- Surface 3 (4G LTE)、Surface 3 タイプ カバー、Surface ペン(端末)
- Windows 10 Pro (OS)
- Nebo(Windows アプリ)
- iPad Pro + Apple Pencil
- MyScript Nebo(iPad アプリ)
- 参考書籍
集合・位相入門 (松坂 和夫(著)、岩波書店)の第2章(集合と濃度)、1(集合の対等と濃度)、(A)集合の対等、例5を取り組んでみる。
関数のグラフ。
コード(Emacs)
Python 3
#!/usr/bin/env python3
from sympy import pprint, symbols, Derivative, plot
print('例5.')
x = symbols('x')
f = x / (1 - x ** 2)
for n in range(1, 3):
D = Derivative(f, x, n)
fn = D.doit()
for t in [D, fn, fn.expand(), fn.factor()]:
pprint(t)
print()
print()
p = plot(f, (x, -0.9, 0.9), show=False, legend=True)
p.save('sample0.svg')
入出力結果(Terminal, Jupyter(IPython))
$ ./sample0.py
例5.
d ⎛ x ⎞
──⎜────────⎟
dx⎜ 2 ⎟
⎝- x + 1⎠
2
2⋅x 1
─────────── + ────────
2 2
⎛ 2 ⎞ - x + 1
⎝- x + 1⎠
2
2⋅x 1
───────────── + ────────
4 2 2
x - 2⋅x + 1 - x + 1
2
x + 1
─────────────────
2 2
(x - 1) ⋅(x + 1)
2
d ⎛ x ⎞
───⎜────────⎟
2⎜ 2 ⎟
dx ⎝- x + 1⎠
⎛ 2 ⎞
⎜ 4⋅x ⎟
2⋅x⋅⎜- ────── + 3⎟
⎜ 2 ⎟
⎝ x - 1 ⎠
──────────────────
2
⎛ 2 ⎞
⎝x - 1⎠
3
8⋅x 6⋅x
- ──────────────────── + ─────────────
6 4 2 4 2
x - 3⋅x + 3⋅x - 1 x - 2⋅x + 1
⎛ 2 ⎞
-2⋅x⋅⎝x + 3⎠
─────────────────
3 3
(x - 1) ⋅(x + 1)
$
HTML5
<div id="graph0"></div> <pre id="output0"></pre> <label for="r0">r = </label> <input id="r0" type="number" min="0" value="0.5"> <label for="dx">dx = </label> <input id="dx" type="number" min="0" step="0.001" value="0.001"> <br> <label for="x1">x1 = </label> <input id="x1" type="number" value="-5"> <label for="x2">x2 = </label> <input id="x2" type="number" value="5"> <br> <label for="y1">y1 = </label> <input id="y1" type="number" value="-5"> <label for="y2">y2 = </label> <input id="y2" type="number" value="5"> <br> <label for="dx0">dx0 = </label> <input id="dx0" type="number" min="0" value="0.01"> <button id="draw0">draw</button> <button id="clear0">clear</button> <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.2.6/d3.min.js" integrity="sha256-5idA201uSwHAROtCops7codXJ0vja+6wbBrZdQ6ETQc=" crossorigin="anonymous"></script> <script src="sample0.js"></script>
JavaScript
let div0 = document.querySelector('#graph0'),
pre0 = document.querySelector('#output0'),
width = 600,
height = 600,
padding = 50,
btn0 = document.querySelector('#draw0'),
btn1 = document.querySelector('#clear0'),
input_r = document.querySelector('#r0'),
input_dx = document.querySelector('#dx'),
input_x1 = document.querySelector('#x1'),
input_x2 = document.querySelector('#x2'),
input_y1 = document.querySelector('#y1'),
input_y2 = document.querySelector('#y2'),
input_dx0 = document.querySelector('#dx0'),
inputs = [input_r, input_dx, input_x1, input_x2, input_y1, input_y2,
input_dx0],
p = (x) => pre0.textContent += x + '\n',
range = (start, end, step=1) => {
let res = [];
for (let i = start; i < end; i += step) {
res.push(i);
}
return res;
};
let f = (x) => x / (1 - x ** 2),
f1 = (x) => (x ** 2 + 1) / (x ** 2 - 1) ** 2,
g = (x0) => (x) => f1(x0) * (x - x0) + f(x0);
let draw = () => {
pre0.textContent = '';
let r = parseFloat(input_r.value),
dx = parseFloat(input_dx.value),
x1 = parseFloat(input_x1.value),
x2 = parseFloat(input_x2.value),
y1 = parseFloat(input_y1.value),
y2 = parseFloat(input_y2.value),
dx0 = parseFloat(input_dx0.value);
if (r === 0 || dx === 0 || x1 > x2 || y1 > y2) {
return;
}
let points = [],
lines = [],
fns = [[f, 'red']],
fns1 = [],
fns2 = [[g, 'green']];
fns
.forEach((o) => {
let [f, color] = o;
for (let x = x1; x <= x2; x += dx) {
let y = f(x);
points.push([x, y, color]);
}
});
fns1
.forEach((o) => {
let [f, color] = o;
lines.push([x1, f(x1), x2, f(x2), color]);
});
fns2
.forEach((o) => {
let [f, color] = o;
for (let x = x1; x <= x2; x += dx0) {
let g = f(x);
lines.push([x1, g(x1), x2, g(x2), color]);
}
});
let xscale = d3.scaleLinear()
.domain([x1, x2])
.range([padding, width - padding]);
let yscale = d3.scaleLinear()
.domain([y1, y2])
.range([height - padding, padding]);
let xaxis = d3.axisBottom().scale(xscale);
let yaxis = d3.axisLeft().scale(yscale);
div0.innerHTML = '';
let svg = d3.select('#graph0')
.append('svg')
.attr('width', width)
.attr('height', height);
svg.selectAll('line')
.data([[x1, 0, x2, 0], [0, y1, 0, y2]].concat(lines))
.enter()
.append('line')
.attr('x1', (d) => xscale(d[0]))
.attr('y1', (d) => yscale(d[1]))
.attr('x2', (d) => xscale(d[2]))
.attr('y2', (d) => yscale(d[3]))
.attr('stroke', (d) => d[4] || 'black');
svg.selectAll('circle')
.data(points)
.enter()
.append('circle')
.attr('cx', (d) => xscale(d[0]))
.attr('cy', (d) => yscale(d[1]))
.attr('r', r)
.attr('fill', (d) => d[2] || 'green');
svg.append('g')
.attr('transform', `translate(0, ${height - padding})`)
.call(xaxis);
svg.append('g')
.attr('transform', `translate(${padding}, 0)`)
.call(yaxis);
[fns, fns1, fns2].forEach((fs) => p(fs.join('\n')));
};
inputs.forEach((input) => input.onchange = draw);
btn0.onclick = draw;
btn1.onclick = () => pre0.textContent = '';
draw();
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