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mod in matlab 在 [心得]Matlab mod function之誤差 - 批踢踢實業坊 的推薦與評價


作者kekeo (wu0w u0w )
看板MATLAB
標題[心得]Matlab mod function之誤差
時間Wed Dec 7 13:55:56 2005

a mod b = 0, but a/b卻不整除
發生在b不是整數且b的倍數非常接近a時
ex: a=-2.3561944901923453,b=0.0087266462599716477
mod(a,b)=0, a/b=-270.00000000000006

Matlab的help裡也有說了

MOD(x,y) is x - n.*y where n = floor(x./y) if y ~= 0. If y is not an
integer and the quotient x./y is within roundoff error of an integer,
then n is that integer.

也就是會有誤差，希望有用到mod寫程式的可以注意一下
找出這問題找了半天.....

--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 140.120.14.167
→ dok:Matlab很多函式都有數值計算的問題,ex:算eigenvalue 12/07 15:02
推 knetlalala:之前也是知道會有錯 都拆開來算 03/22 20:13
→ knetlalala:原來追根究底是這個原因@@ 03/22 20:13






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mod in matlab 在 Modular Exponentiation in Matlab (x ^ y mod n) - gists · GitHub 的推薦與評價

Modular Exponentiation in Matlab (x ^ y mod n). GitHub Gist: instantly share code, notes, and snippets. ... <看更多>

mod in matlab 在 Publishing MATLAB Code - MATLAB & Simulink - Pinterest 的推薦與評價


Nov 12, 2018 - MATLAB provides options for presenting your code to others, including using publishing and creating live scripts and functions in the Live ... ... <看更多>

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