How to solve 5 equations with 5 unknowns
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Hinko Fic
el 29 de Mayo de 2015
Respondida: Alex Sha
el 12 de Oct. de 2019
Hi, I don't have any idea how to solve this system. I'm beginner so i don't knew how to write corect code. Pls help me. Equations:
(A-B-C)*5=C*6 ////
(A-B-C)*2+B*3=(A-B)*D ////
(A-B)*(2-D)=B*3 ////
(A-B)*2+B*4=B*E ////
A*2+(A-B)*3+(A-B-C)*2=50
7 comentarios
Roger Stafford
el 11 de Mzo. de 2018
I don't remember this problem from almost two years ago, but apparently all of us (except perhaps Muhammad Saleem) overlooked the fact that it is actually a system of five linear equations in the five unknown quantities, A, B, C, d=(A-B)*D, and e=B*E, so it can be solved for these latter five variables using matrix division. From those solutions, it is easy to then find D and E: D = d/(A-B) and E = e/B.
Respuesta aceptada
Roger Stafford
el 29 de Mayo de 2015
Editada: Roger Stafford
el 29 de Mayo de 2015
You can use 'solve' in the Symbolic Toolbox to solve them.
My alternate method was in error. Just use 'solve'. It does very well.
5 comentarios
Walter Roberson
el 30 de Mayo de 2015
structfun(@double, sol, 'Uniform', 0)
will return back a structure whose fields are a, b, c, d, e. For any particular one of them you can use (e.g.) double(sol.b)
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Alex Sha
el 12 de Oct. de 2019
Numercial solution:
a: 9.00473933649289
b: 1.18483412322275
c: 3.55450236966825
d: 1.54545454545455
e: 17.2
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