Solve an equation of fourth degree with two variables

9 visualizzazioni (ultimi 30 giorni)
I have to solve an equation of fourth degree with two variables, and draw the line where it is equal to zero. I tried to do that but I got an error message when I tried to place a value in x1_sol:
syms x y;
v=1/16*(3*x+17*y/3)*(-x^3-6*y^2-11*x+y)+1/96*(34*x+130*y)*/(3*x-y);
x_sol=solve(v==0,x,'MaxDegree', 4);
x1_sol=x_sol(1);
x1_sol(9);
Where am I wrong? Do I use the right way?
  3 Commenti
AAA
AAA il 23 Mag 2013
Modificato: AAA il 23 Mag 2013
Error using mupadmex
Error in MuPAD command: Index exceeds matrix dimensions.
Error in sym/subsref (line 1577)
B = mupadmex('symobj::subsref',A.s,inds{:});
Error in Hw4 (line 7)
x1_sol(9);

Accedi per commentare.

Risposta accettata

Valmir Sadiku
Valmir Sadiku il 23 Mag 2013
i don't know what you are trying with this command x1_sol=x_sol(1); because the size of the x_sol are:
>> size(x_sol)
ans =
1 1
that's because it should be clear why x1_sol(9); give you an error message!
  5 Commenti
Valmir Sadiku
Valmir Sadiku il 23 Mag 2013
i never saw this command 'subs' bevor, so i think now you got the solution of your problem?
AAA
AAA il 24 Mag 2013
Modificato: AAA il 24 Mag 2013
yes, it's exactly what I needed. thanks!

Accedi per commentare.

Più risposte (0)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by