[線代] 一些內積的問題
1. evaluate u．v and ||u*v|| if ||u||=2, ||v||=5, ||u+v||=1, ||u-v||=5
[0 0 -2]
2. A = [1 2 1], find the orthonormal basis for the column space of A
[1 0 3]
為什麼書上先算eigenvalue = 1, 2
然後{[-2, 1, 1]}為1對應的eigenspace之一basis
{[-1, 0, 1], [0, 1, 0]}為2對應的eigenspace之一basis
請問這個是題目要求的嗎?
3. the area of a triangle with two sides given by a = <1, 3, -1> and
b = <2, -1, 2> is ?
[ 1 2]
A=[ 3 -1]
[-1 2]
T
為什麼area = (1/2) * 根號[ det(A A) ]
謝謝
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 61.228.25.26
討論串 (同標題文章)