MATLAB hang while inverting a matrix

why MATLAB hang while inverting that matrix, I left it more than a day willing to get any result, but nothing happened

K_total\[0;0;0;0;0;0;0;0;0;0;1;0;0;0;0;0;0;0;0;0;0];

Thanks

[Einav Namer]

what is K_total?

Answer 1

[ash]

Kindly find the attached file containing K_total, It was attached with my question

[ash]

K_total

Answer 2

[Walter Roberson]

Your K_total is symbolic so you are asking for a symbolic solution rather than a numeric solution.

[ash]

yes, exactly The answer supposed to be 21x1 matrix, I notice that it took all of the ram memory (on a device with 8G ram)

How can i get that symbolic matrix?

[John D'Errico]

You may think that a symbolic result with only 21 unknowns cannot be too big, but it will be IMMENSE.

[Walter Roberson]

I cannot read the .mat file as I do not have the symbolic toolbox, so I do not know how complex it is.

But remember that even just the exact solutions of a quartic is very big.