2017年8月2日水曜日

学習環境

ラング線形代数学(上)(S.ラング (著)、芹沢 正三 (翻訳)、ちくま学芸文庫)の6章(行列式)、5(置換)、練習問題2.を取り組んでみる。


    1. [ 1 2 3 3 1 2 ]

    2. [ 1 2 3 2 3 1 ]

    3. [ 1 2 3 3 2 1 ]

    4. [ 1 2 3 4 3 1 2 4 ]

    5. [ 1 2 3 4 2 1 4 3 ]

    6. [ 1 2 3 4 4 2 1 3 ]

コード(Emacs)

HTML5

<pre id="output0"></pre>

<button id="run0">run</button>
<button id="clear0">clear</button>

<script src="sample2.js"></script>    

JavaScript

let pre0 = document.querySelector('#output0'),
    btn0 = document.querySelector('#run0'),
    btn1 = document.querySelector('#clear0'),
    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 nums1 = range(1, 4),
    nums2 = range(1, 5),
    a = {1:2, 2:3, 3:1},
    b = {1:3, 2:1, 3:2},
    c = {1:3, 2:2, 3:1},
    d = {1:2, 2:3, 3:1, 4:4},
    e = {1:2, 2:1, 3:4, 4:3},
    f = {1:3, 2:2, 3:4, 4:1},
    a1 = {1:3, 2:1, 3:2},
    b1 = {1:2, 2:3, 3:1},
    c1 = {1:3, 2:2, 3:1},
    d1 = {1:3, 2:1, 3:2, 4:4},
    e1 = {1:2, 2:1, 3:4, 4:3},
    f1 = {1:4, 2:2, 3:1, 4:3};    
    
let output = () => {
    [[a, a1], [b, b1], [c, c1]]
        .forEach(([f, f1], i) =>
                 p(`${String.fromCodePoint('a'.codePointAt(0) + i)}: ` +
                   `${nums1.map((i) => f[i]).map((i) => f1[i])}`));
    [[d, d1], [e, e1], [f, f1]]
        .forEach(([f, f1], i) =>
                 p(`${String.fromCodePoint('a'.codePointAt(0) + i + 4)}: ` +
                   `${nums2.map((i) => f[i]).map((i) => f1[i])}`));
                 
};

btn0.onclick = output;
btn1.onclick = () => pre0.textContent = '';
output();





    








 
						

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