Solving simultaneous equations numerically

I am unable to get the value of R2 and C, any advice ... thank you

clear all
close all
syms s I1 I2 R2 C
a=8000
a1=4.08E7
l=1;
R=1E6;
e1=(s+R)*I1-R*I2==1;
i1=solve(e1,I1);
e2=-R*i1+(R2+R+1/(C*s))*I2==0;
i2=solve(e2,I2);
v0=(1/(C*s))*i2;
S=solve((1/(R*C+R*R2*C))==a,R/(R*C+R*R2*C)==a1)

[Star Strider]

What is the initial problem you are solving?

It looks like you did not set up the problem correctly.

[diana betancur]

yes it is all good up to v0; then I get that equation to get the values of s^2,s and numerical. The part I need help is with the S, just to solve the equations because it gets : I just need to solve R2 and C

if true
  %   C: [0×1 sym]
      R2: [0×1 sym]

[Star Strider]

Everything up to the ‘S’ assignment have nothing at all to do with the equations in your solve call for ‘S’.

Additionally:

Eq1 = (1/(R*C+R*R2*C))==a;
Eq2 = R/(R*C+R*R2*C)==a1;

Eq1 =
8000000000*C*(R2 + 1) == 1

Eq2 =
40800000*C*(R2 + 1) == 1

Those are incompatible.

[diana betancur]

yes but I wanted to solve first for C and then plug it into the second equation to get a value for R2

[Star Strider]

That won’t work.

Eq1 = (1/(R*C+R*R2*C))==a;
Eq2 = R/(R*C+R*R2*C)==a1;
Eq1 = simplify(Eq1)
Eq2 = simplify(Eq2)
Cs = solve(Eq1, C)
Eq2s = subs(Eq2,C,Cs)
Eq2s = Eq2s * (8000000000*R2 + 8000000000)
R2s = solve(Eq2s,R2)

Eq1 =
8000000000*C*(R2 + 1) == 1

Eq2 =
40800000*C*(R2 + 1) == 1

Cs =
1/(8000000000*R2 + 8000000000)

Eq2s =
(40800000*(R2 + 1))/(8000000000*R2 + 8000000000) == 1

Eq2s =
40800000*R2 + 40800000 == 8000000000*R2 + 8000000000

R2s =
-1