MATLAB How to calculate equation system in Matlab, with some knowns

[berdan]

It's part of finite elements analysis.
All I need is to solve F=Ku,K is [12x12] matrix .
Some of the members of u are zeros ,some members of F are known forces . K is all known .
How do I solve F=Ku in that way ??

Thanks in advance.

 

[SteamKing]

It's not clear if your K matrix is for a single structure or is the stiffness matrix for one element.

In any event, if you haven't studied linear algebra, particularly things like Gaussian elimination or Cholesky decomposition, now will be a good time.

If you are studying finite element analysis, there is usually part of the course which is devoted to solving the system of equations and understanding the various methods.

 

[timthereaper]

If this is just a Matlab question, then use u = K \ F. If it's a finite element question, you need to consult a few textbooks first.

 

[berdan]

It's not clear if your K matrix is for a single structure or is the stiffness matrix for one element.

In any event, if you haven't studied linear algebra, particularly things like Gaussian elimination or Cholesky decomposition, now will be a good time.

If you are studying finite element analysis, there is usually part of the course which is devoted to solving the system of equations and understanding the various methods.

I studied Linear Algebra ,and that's overcomplicating things .
All I am asking : How do I solve in Matlab something like this :
[A] [1 0 1 0][M]
[V] [0 1 2 0][N]
[0]=EA/L [0 1 2 0][Q]
[D] [0 4 5 4][L]

Where I know some of the variables in the first matrix ,and I know some variables in the last matrix (in a form of parameter,lets say Q is known and given) .
I need to find A,B,C,D,M,N and L .
How do I do this in Matlab ?