matrix math problems , error in matrix size
1 vue (au cours des 30 derniers jours)
Afficher commentaires plus anciens
i have a rectangular matrix of size 18 by 3 and a column of 18 by 1, when I try to solve for the x matrix (3 by 1) it says I have incorrect sized dimensions to do the math, why? mat lab says the rows should agree and it should allow me to divide them using "/"
xx=[x_e; x_a; x_w];
NU=[lnu_e;lnu_a;lnu_w];
co=xx/NU;
0 commentaires
Réponse acceptée
Paul
le 22 Oct 2022
Hard to say without without knowing anything about the data in the question. Based on the wording it should work as follows
A = rand(18,3); % 18 by 3
b = rand(18,1); % 18 by 1
x = A\b % solve for 3 x 1, note use of backslash
The result does not satisfy the matrix equation because there are more equations than unknowns
norm(A*x - b)
0 commentaires
Plus de réponses (1)
Walter Roberson
le 22 Oct 2022
xx = rand(18,3);
NU = rand(18,1);
try
xx/NU
fprintf('/ worked\n');
catch ME
fprintf('well, / did not work\n');
end
try
xx\NU
fprintf('\\ worked\n');
catch ME
fprintf('well, \\ did not work\n');
end
2 commentaires
Voir également
Catégories
En savoir plus sur Linear Algebra dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!