Inverse of matrix multiplied by vector

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Mohamed Amine Mouajib
Mohamed Amine Mouajib on 15 Dec 2021
Edited: Jan on 15 Dec 2021
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

Answers (1)

Jan
Jan on 15 Dec 2021
Edited: Jan on 15 Dec 2021
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

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