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[問題] 定積分問題

[ Prob_Solve ]26 留言, 推噓總分: +12

作者: M013020058 - 發表於 2020/10/20 23:15(3年前)

2^F推j0958322080: 丟 mathematica10/21 07:56

[問題] SVD影像壓縮

[ Prob_Solve ]7 留言, 推噓總分: +2

作者: j0958322080 - 發表於 2019/06/20 00:02(4年前)

6^F→j0958322080: 所謂保持特徵有什麼例子嗎？06/23 09:40

8^F→j0958322080: CNN的特徵萃取是使用max pooling11/20 14:28

[問題] 降低 QR 分解的演算複雜度

[ Prob_Solve ]17 留言, 推噓總分: +5

作者: j0958322080 - 發表於 2018/04/05 02:06(6年前)

5^F→j0958322080: 我是已經這樣算了，但這樣複雜度還是O(m*m*n*n)04/05 09:18

6^F→j0958322080: QR分解裡面的迴圈都是從 k 開始不是從 1 開始04/05 09:20

9^F→j0958322080: 好像沒辦法這樣算耶，要先把 H 算出來才可以乘 A04/05 14:04

11^F→j0958322080: Q其實也可以從 k 開始，因為拆成方塊矩陣後左上角的04/05 20:26

12^F→j0958322080: 是單位矩陣，所以只需要乘右下角的矩陣，但這樣複雜04/05 20:26

13^F→j0958322080: 度還是m*m*n*n04/05 20:26

17^F→j0958322080: 這樣感覺有點像是用空間換時間??04/09 21:14

[問題] 單做數值計算有需要再學資料結構嗎？

[ Prob_Solve ]6 留言, 推噓總分: +2

作者: j0958322080 - 發表於 2018/01/16 11:33(6年前)

3^F→j0958322080: 最近在看資料結構，確實不需要XD01/26 19:30

7^F→j0958322080: 本身就在做數值計算，只是想說有無必要在學資料結構02/12 21:45

Re: [問題] 解最小平方法的問題 Ax~b

[ Prob_Solve ]10 留言, 推噓總分: +2

作者: j0958322080 - 發表於 2018/01/02 23:12(6年前)

9^F→j0958322080: 這樣看起來這問題最佳解法應該是共軛梯度法了01/03 10:30

10^F→j0958322080: 不過後來看一下應該是對於不同的條件有不同的step si01/03 10:46

11^F→j0958322080: ze，所以不想繼續修改程式的話SVD或QR還是最佳選項01/03 10:46

[請益] 尋找數學軟體

[ Prob_Solve ]7 留言, 推噓總分: +4

作者: paddyzb - 發表於 2017/12/30 21:42(6年前)

3^F推j0958322080: 自己寫一個12/31 00:37

Re: [問題] 解最小平方法的問題 Ax~b

[ Prob_Solve ]6 留言, 推噓總分: +2

作者: DJWS - 發表於 2017/12/25 13:09(6年前)

1^F推j0958322080: 我覺得這誤差應該跟計算太多次有關係，目前在想是否12/25 15:07

2^F→j0958322080: 可以利用什麼數學定理來減少計算量。不過梯度下降法12/25 15:08

3^F→j0958322080: 我之前以為只是要得到最小誤差的理論推導而已，之後12/25 15:09

4^F→j0958322080: 會試試看這個演算法和QR分解，感謝12/25 15:09

5^F推j0958322080: 我剛剛看了一下，最好的方法是把A做QR分解，整個問題12/25 15:20

6^F→j0958322080: 就只剩下 Qx = Rb，剩下解線性方城組就好12/25 15:20

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