Solving An Equation - Linear Algebra

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Hazem El Sankari
Hazem El Sankari 2018-11-21
编辑： Star Strider 2018-11-22
Hello,
I would like to solve the following equation:
eqn = Ff == Kff*uf + Kfs*us; % I want to solve for uf knowing that
Kff =
3.0240 0.7680
0.7680 3.2427
Kfs =
0 0 -1.0240 -0.7680 -2.0000 0
0 -2.6667 -0.7680 -0.5760 0 0
Ff =
0
0
us =
0
-25
0
0
0
0
The problem is that I'm getting an error from MATLAB saying that uf is not defined, uf is supposed to be a 2x1 matrix but I want to solve for it. How can I do that?

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采纳的回答

Star Strider
Star Strider 2018-11-21
编辑：Star Strider 2018-11-22
Straightforward:
KFF = Kff \ -(Kfs*us)
KFF =
5.5556
-21.8750
Another option is to use fsolve:
[UF, fval] = fsolve(@(uf) Kff*uf + Kfs*us, [1; 1])
UF =
5.5556
-21.8750
fval =
-7.1054e-015
-14.2109e-015
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Hazem El Sankari
Hazem El Sankari 2018-11-21
Thanks again for your quick and helpful reply!
Star Strider
Star Strider 2018-11-21
My pleasure.
If my Answer helped you solve your problem, please Accept it!

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