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LU分解以及上下三角矩陣疑問
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周宗鴻
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Feb 11, 2016, 9:38:29 AM
2/11/16
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to 黃子嘉 - 線代離散研究室
老師 ~ 想問一下104台大工科這題,這邊的U是上三角矩陣嗎?(主要是想問非方陣可以是上下三角矩陣嗎?)
再麻煩老師解答了 ~ 祝老師新年快樂 ^_^
林立宇
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Feb 14, 2016, 10:58:06 PM
2/14/16
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to 黃子嘉 - 線代離散研究室
上三角和下三角矩陣都只定義在方陣上
新年快樂~
Lambert Tao
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Feb 15, 2016, 12:11:06 AM
2/15/16
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to 黃子嘉 - 線代離散研究室
老師但我看到這題是這樣寫誒?
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xian C
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Feb 15, 2016, 3:17:56 AM
2/15/16
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to zjh...@googlegroups.com
A = LU 若A:n*n 則 L,U:n*n
L為下三角 U為上三角
而若A:m*n 則L:m*m, U:m*n
L為下三角 U為首項不一定是1的row echelon form
沒記錯的話是這樣~
林立宇
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Feb 18, 2016, 8:20:05 AM
2/18/16
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to 黃子嘉 - 線代離散研究室
是的, 我的意思是我們書上定義的上三角矩陣, 指的都是方陣
LU 分解的 U 是一個和 A 大小一樣, 就是 A 的 row echelon form
長得像階梯型
但一般我們不會說 U 是上三角矩陣
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