# F=Kff*uf - Matrix operation

조회 수: 5 (최근 30일)
BioZ 2021년 5월 11일
댓글: Rik 2021년 5월 11일
Greetings everyone, I am trying to do some simple matrix operation in Matlab.
I have equation: Ff=Kff*Uf where Ff is 3x1 matrix, Kff is 3x3 matrix and Uf is 3x1 matrix. As in the following picture.
How can I solve this to find U1,U2,U3 in matlab?
When I attempt solving this with matlab I get number of errors such as: (Error using / ).
Any help would be much appreciated. Thank you.
clc
clear
F = [383.02;
321.39;
0;];
Kff = [634.8 -191.2 -353.6;
-191.2 447.3 353.6;
-353.6 353.6 683;];
%%Uf = F./Kff

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### 채택된 답변

Rik 2021년 5월 11일
You were almost there:
F = [383.02;
321.39;
0;];
Kff = [634.8 -191.2 -353.6;
-191.2 447.3 353.6;
-353.6 353.6 683;];
Uf=Kff\F
Uf = 3×1
0.8703 1.2431 -0.1930
fprintf('%.5f\n',F-Kff*Uf)%check if they are indeed equal (within a rouding error)
0.00000 0.00000 -0.00000

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### 추가 답변 (1개)

EmirBeg 2021년 5월 11일
Maybe like this?
F = [383.02;
321.39;
0;];
Kff = 10^2* [634.8 -191.2 -353.6;
-191.2 447.3 353.6;
-353.6 353.6 683];
Uf = F'/Kff; % You used a dot but u need to use ' to transpose
##### 댓글 수: 1이전 댓글 -1개 표시이전 댓글 -1개 숨기기
Rik 2021년 5월 11일
Almost. You would have to transpose the result again to make sure Uf is a column vector.
F = [383.02;321.39;0];
Kff = 10^2* [634.8 -191.2 -353.6;-191.2 447.3 353.6;-353.6 353.6 683];
Uf = (F.'/Kff).'
Uf = 3×1
0.0087 0.0124 -0.0019
fprintf('%.5f\n',F-Kff*Uf)%check if they are indeed equal (within a rouding error)
0.00000 -0.00000 0.00000

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