how to solve matrix equation?
2 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
Nara Lee
el 18 de Abr. de 2021
Respondida: Nara Lee
el 24 de Abr. de 2021
I want to solve a equation which has vector known elements and obvisouly the answer should be vector too.
x1=sym('x1',[121 1]);
x2=sym('x2',[121 1]);
s=solve(x1+x2==n1,x1.*x2==n2,[x1,x2]);
but I think I didn't write the right code coz it's been a long time that is busy and there is no answer yet. I really need your help.
0 comentarios
Respuesta aceptada
Walter Roberson
el 22 de Abr. de 2021
x1+x2=n1
x1*x2=n2
so
x2 = n1-x1
x1*(n1-x1) = n2
x1*n1-x1^2 = n2
x1^2 - x1*n1 + n2 = 0
and solve the quadratic to get x1 and then x2. There will be two solutions
Do this just for scalars to get the forms of the solutions. Then substitute in the vectors.
4 comentarios
Walter Roberson
el 24 de Abr. de 2021
format long g
A = rand(42,2);
Ainv = pinv(A);
Ainv * A
It isn't clear what you mean when you say that you want A * Ainv = 1 for a non-square matrix. Do you mean a matrix with all ones? Do you mean a non-square matrix in which the main diagonal is 1 and the rest is 0? What size do you expect A*Ainv to be?
Más respuestas (1)
Ver también
Categorías
Más información sobre Linear Algebra en Help Center y File Exchange.
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!