看板 Grad-ProbAsk 關於我們 聯絡資訊
※ 引述《maxwellyann (不彥其煩)》之銘言: : 煩請各位大大撥冗來幫我解決著個問題好嗎?急著要破解它! : 那麼不多說,題目如下: : Find the transition matrix representing the change of coordinate on P3, : where P3 denotes the set of all polynomials of degree less than 3, : from the basis α=[1,x,x^2] to the basis β=[1,1+x,1+x+x^2], also : find the coordinate of f=a+bx+cx^2 relative to basisβ. : 答案: : transition matrix T is [(1,0,0)^t,(-1,1,0)^t,(0,-1,1)^t] : the coordinate of f=a+bx+cx^2 relative to basisβ is : → : fβ=[(a-b)^t,(b-c)^t,(c)] : =T[a,b,c]^t -1 α [1 1 1] β α -1 [1 1 1] [1 -1 0] [I] =[0 1 1] , T = [I] = ( [I] ) = [0 1 1] = [0 1 -1] β [0 0 1] α β [0 0 1] [0 0 1] 和解答完全一樣 : 我有疑問的是,我算出來的T與解答不一樣耶!在題目敘述中有甚麼特別的提示嗎? : 還有該如何解? : 另外第二個問題的答案也可以請各位大大幫我看一下嗎? : 先謝謝嚕! [a] [f] = [b] α [c] β [1 -1 0] [a] [a-b] [f] = [I] [f] = T [f] = [0 1 -1] [b] = [b-c] β α α α [0 0 1] [c] [ c ] 和解答寫的沒有不一樣 所以不知道你寫了什麼? -- -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 203.73.234.40 ※ 編輯: ILzi 來自: 203.73.234.40 (02/15 02:52)
maxwellyann:謝謝這位大大的解答,結果我發現...原來是β看錯了= = 02/15 11:45
maxwellyann:大大感是得非常清楚,非常感謝尼! 02/15 11:53