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作者 walkwall 在 PTT [ Math ] 看板的留言(推文), 共511則

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[其他] 價格與數量變化對新增份額佔比

[ Math ]22 留言, 推噓總分: +2

作者: Tesngray - 發表於 2021/09/14 22:38(3年前)

1^F推walkwall: 你這是想用線性的答案去回答一個非線性的問題09/14 23:17

3^F→walkwall: 如果只是單純想解決問題那就把乘積取log 這樣就09/14 23:24

4^F→walkwall: 能用線性的方式計算貢獻度了09/14 23:25

[微積] 請問函數為何不能一對多

[ Math ]26 留言, 推噓總分: +4

作者: rebe212296 - 發表於 2021/09/06 15:54(3年前)

1^F推walkwall: 定義是一層層往上的如果函數沒這定義光是連續不09/06 16:16

2^F→walkwall: 連續就無法定義後面可微什麼的都不用說了09/06 16:16

[幾何] 遇到一個生活中的幾何問題

[ Math ]23 留言, 推噓總分: +3

作者: coolmayday - 發表於 2021/07/25 00:44(3年前)

1^F推walkwall: 搬運沙發左右轉問題 Ambidextrous Moving Sofa07/25 08:15

2^F→walkwall: Problem07/25 08:16

3^F→walkwall: https://www.thenewslens.com/article/7325807/25 08:16

8^F推walkwall: 表示你想的問題很有趣+有難度才會變成經典問題07/25 15:37

9^F→walkwall: 沙發問題是將這問題標準化的結果目標是通過標準寬07/25 15:38

10^F→walkwall: 度的左右轉90度狹道沙發最大面積能做到多大07/25 15:38

11^F→walkwall: 既然目前最佳解是18段微方解繪製出的形狀其實表示07/25 15:39

12^F→walkwall: 還有往上的空間XD 但是如果真做出來也能發論文就是07/25 15:40

[中學] 數資班考題一題

[ Math ]8 留言, 推噓總分: +5

作者: TwIsAcountry - 發表於 2021/07/11 17:19(3年前)

2^F推walkwall: imgur應該不會只有5碼吧07/11 18:58

[機統] 關於大數法則

[ Math ]13 留言, 推噓總分: +1

作者: pennyleo - 發表於 2021/06/30 21:57(3年前)

1^F推walkwall: 你的討論完全忽略了標準差/變異數06/30 22:33

2^F→walkwall: 首先常態分布才能相加後函數長得一樣(只差縮放)06/30 22:34

3^F→walkwall: 然後大數法則的前提是原始分布的標準差為"有限"06/30 22:35

4^F→walkwall: 如果標準差為無限大只會收斂到穩定分布這更大集合06/30 22:37

[其他] 一個積分或微分 17or18次的反例

[ Math ]6 留言, 推噓總分: +3

作者: plyong95084 - 發表於 2021/06/28 18:53(3年前)

5^F→walkwall: 好有趣原來有這種例子06/29 15:34

[中學] 請問ㄧ題矩陣線性變換

[ Math ]2 留言, 推噓總分: +1

作者: yizihappyQ - 發表於 2021/06/27 13:43(3年前)

1^F推walkwall: 感覺你沒算錯會不會是答案有錯06/27 16:11

Re: [機統] 袋子裝彩金問題

[ Math ]25 留言, 推噓總分: +11

作者: rax921930 - 發表於 2021/06/24 08:41(3年前)

7^F推walkwall: 想要有預估的話要先假定一個統計模型然後MLE06/24 14:35

8^F→walkwall: 資料這麼少應該不是打算搞機器學習模型吧06/24 14:35

[機統] 求解各位大神

[ Math ]12 留言, 推噓總分: +3

作者: encoreb00124 - 發表於 2021/06/18 21:17(3年前)

11^F推walkwall: XDDDD06/19 10:11

[高中] 排列組合

[ Math ]18 留言, 推噓總分: +6

作者: stanley413 - 發表於 2021/06/13 20:10(3年前)

1^F推walkwall: 相當於走m+n的格子路徑所以算法也是c(7+7,7)=343206/13 21:24

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