MATLAB: Symbolic variables: Isolate a variable in an equation

isolatesymbolicvariables

I always have trouble isolating symbolic variables in equations. See this for example:

 8*x1 + 2*x2 + 3*x3 - 51 = 0

want to isolate x1, manually know is this:

x1 = (51 – 2*x2 – 3*x3)/8

how can I do this in matlab? Thanks in advance.

Best Answer

solve(8*x1 + 2*x2 + 3*x3 - 51, x1)

Related Solutions

MATLAB: How to get symbolic output notation, exp(1)=e

syms u(x);
sympref('FloatingPointOutput',false);
Du=diff(u);
ode=diff(u,x,2)==4*u
ode(x) = 
cond1=u(0)==0
cond1 = 
cond2=Du(1)==exp(sym(2))-exp(sym(-2))
cond2 = 
conds=[cond1 cond2];
uSol(x)=dsolve(ode,conds)
uSol(x) = 
uSol = simplify(uSol)
uSol(x) =

MATLAB: I failed to solve 4 equation differential equation. I’m giving the code. the same code for two equation worked well. The point the program stuck is dsolve(ode1,ode2,ode3,ode4) or dsolve(odes) and never it finishes.

Your equations ode1 and ode4 actually contains linearly dependent terms which are

3*u + 4*v(ode1), 6*u + 8*v(ode4)

This situation brings about infinitely many solutions to your system, therefore actually a unique solution can not be found. For instance if you change your term into

6*u + 7*y

in ode4, you will see that a unique solution is quickly found.

Best Answer

Related Solutions

MATLAB: How to get symbolic output notation, exp(1)=e

MATLAB: I failed to solve 4 equation differential equation. I’m giving the code. the same code for two equation worked well. The point the program stuck is dsolve(ode​1,ode2,ode​3,ode4) or dsolve(odes) and never it finishes.

Related Question

MATLAB: I failed to solve 4 equation differential equation. I’m giving the code. the same code for two equation worked well. The point the program stuck is dsolve(ode1,ode2,ode3,ode4) or dsolve(odes) and never it finishes.