Inverse of matrix multiplied by vector

So I have this matrix

K = [ 168.57 4296.29 7250

0 998888.89 241666.67

0 0 1063333.33]

And this vector :

P = [ 0

-3456

3456]

I need to compute U = K^-1 * P

[Chunru]

doc inv

Answer 1

[Jan]

K = [  168.57        4296.29     7250; ...
       0           998888.89   241666.67; ...
       0                   0   1063333.33];
P = [0; -3456; 3456];

u = K^-1 * P  % Exactly what you have written already

u = 3×1

-0.0316 -0.0042 0.0033

u = inv(K) * P

u = 3×1

-0.0316 -0.0042 0.0033

u = K \ P   % This is the fastest and most accurate method

u = 3×1

-0.0316 -0.0042 0.0033