推 wsx02 :請問為什麼可以suppose d=xa+yb+zc? 11/21 10:26
→ THEJOY :因為linear dependent 11/21 10:51
※ 引述《wsx02 (無酒罐)》之銘言：
: Given 3*3 matrix A and four vectors
: a=[1 1 0]^T, b=[5 3 2]^T, c=[1 3 -1]^T, d=[-2 2 -3]^T
: satisfying Aa=b, Ab=c, Ac=d, find Ad
suppose d=xa+yb+zc
x+5y+c=-2
=> x+3y+3c=-2 => x=2,y=-1,z=1
2y-c=-3
so Ad=A(2a-b+c)=2Aa-Ab+Ac=2b-c+d=[7 5 2]^T
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 140.111.9.90