F=Kff*uf - Matrix operation

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

Answer 1

[Rik]

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

Answer 2

[EmirBeg]

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

[Rik]

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